What is the general solution for (cos(x))/(csc(x))+(sin(x))/(sec(x))=1 ?

The general solution for (cos(x))/(csc(x))+(sin(x))/(sec(x))=1 is x= pi/4+pin

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(cos(x))/(csc(x))+(sin(x))/(sec(x))=1

Solution

\frac{cos ( x )}{csc ( x )} + \frac{sin ( x )}{sec ( x )} = 1

Solution

x = \frac{π}{4} + πn

Degrees

x = 4 5^{\circ} + 18 0^{\circ} n

Solution steps

\frac{cos ( x )}{csc ( x )} + \frac{sin ( x )}{sec ( x )} = 1

Subtract

1

from both sides

\frac{cos ( x )}{csc ( x )} + \frac{sin ( x )}{sec ( x )} - 1 = 0

Simplify

\frac{cos ( x )}{csc ( x )} + \frac{sin ( x )}{sec ( x )} - 1 : \frac{cos ( x ) sec ( x ) + sin ( x ) csc ( x ) - csc ( x ) sec ( x )}{csc ( x ) sec ( x )}

\frac{cos ( x )}{csc ( x )} + \frac{sin ( x )}{sec ( x )} - 1

Convert element to fraction:

1 = \frac{1}{1}

= \frac{cos ( x )}{csc ( x )} + \frac{sin ( x )}{sec ( x )} - \frac{1}{1}

Least Common Multiplier of

csc (x), sec (x), 1 : csc (x) sec (x)

csc (x), sec (x), 1

Lowest Common Multiplier (LCM)

Compute an expression comprised of factors that appear in at least one of the factored expressions

= csc (x) sec (x)

Adjust Fractions based on the LCM

Multiply each numerator by the same amount needed to multiply its

corresponding denominator to turn it into the LCM

csc (x) sec (x)

For

\frac{cos ( x )}{csc ( x )} :

multiply the denominator and numerator by

sec (x)

\frac{cos ( x )}{csc ( x )} = \frac{cos ( x ) sec ( x )}{csc ( x ) sec ( x )}

For

\frac{sin ( x )}{sec ( x )} :

multiply the denominator and numerator by

csc (x)

\frac{sin ( x )}{sec ( x )} = \frac{sin ( x ) csc ( x )}{sec ( x ) csc ( x )}

For

\frac{1}{1} :

multiply the denominator and numerator by

csc (x) sec (x)

\frac{1}{1} = \frac{1 \cdot csc ( x ) sec ( x )}{1 \cdot csc ( x ) sec ( x )} = \frac{csc ( x ) sec ( x )}{csc ( x ) sec ( x )}

= \frac{cos ( x ) sec ( x )}{csc ( x ) sec ( x )} + \frac{sin ( x ) csc ( x )}{sec ( x ) csc ( x )} - \frac{csc ( x ) sec ( x )}{csc ( x ) sec ( x )}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{cos ( x ) sec ( x ) + sin ( x ) csc ( x ) - csc ( x ) sec ( x )}{csc ( x ) sec ( x )}

\frac{cos ( x ) sec ( x ) + sin ( x ) csc ( x ) - csc ( x ) sec ( x )}{csc ( x ) sec ( x )} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

cos (x) sec (x) + sin (x) csc (x) - csc (x) sec (x) = 0

Express with sin, cos

cos (x) sec (x) - csc (x) sec (x) + csc (x) sin (x)

Use the basic trigonometric identity:

sec (x) = \frac{1}{cos ( x )}

= cos (x) \frac{1}{cos ( x )} - csc (x) \frac{1}{cos ( x )} + csc (x) sin (x)

Use the basic trigonometric identity:

csc (x) = \frac{1}{sin ( x )}

= cos (x) \frac{1}{cos ( x )} - \frac{1}{sin ( x )} \cdot \frac{1}{cos ( x )} + \frac{1}{sin ( x )} sin (x)

Simplify

cos (x) \frac{1}{cos ( x )} - \frac{1}{sin ( x )} \cdot \frac{1}{cos ( x )} + \frac{1}{sin ( x )} sin (x) : \frac{- 1 + 2 sin ( x ) cos ( x )}{sin ( x ) cos ( x )}

cos (x) \frac{1}{cos ( x )} - \frac{1}{sin ( x )} \cdot \frac{1}{cos ( x )} + \frac{1}{sin ( x )} sin (x)

cos (x) \frac{1}{cos ( x )} = 1

cos (x) \frac{1}{cos ( x )}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{1 \cdot cos ( x )}{cos ( x )}

Cancel the common factor:

cos (x)

= 1

\frac{1}{sin ( x )} \cdot \frac{1}{cos ( x )} = \frac{1}{sin ( x ) cos ( x )}

\frac{1}{sin ( x )} \cdot \frac{1}{cos ( x )}

Multiply fractions:

\frac{a}{b} \cdot \frac{c}{d} = \frac{a \cdot c}{b \cdot d}

= \frac{1 \cdot 1}{sin ( x ) cos ( x )}

Multiply the numbers:

1 \cdot 1 = 1

= \frac{1}{sin ( x ) cos ( x )}

\frac{1}{sin ( x )} sin (x) = 1

\frac{1}{sin ( x )} sin (x)

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{1 \cdot sin ( x )}{sin ( x )}

Cancel the common factor:

sin (x)

= 1

= 1 - \frac{1}{sin ( x ) cos ( x )} + 1

Group like terms

= - \frac{1}{sin ( x ) cos ( x )} + 1 + 1

Add the numbers:

1 + 1 = 2

= - \frac{1}{sin ( x ) cos ( x )} + 2

Convert element to fraction:

2 = \frac{2 sin ( x ) cos ( x )}{sin ( x ) cos ( x )}

= - \frac{1}{sin ( x ) cos ( x )} + \frac{2 sin ( x ) cos ( x )}{sin ( x ) cos ( x )}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{- 1 + 2 sin ( x ) cos ( x )}{sin ( x ) cos ( x )}

= \frac{- 1 + 2 sin ( x ) cos ( x )}{sin ( x ) cos ( x )}

\frac{- 1 + 2 cos ( x ) sin ( x )}{cos ( x ) sin ( x )} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

- 1 + 2 cos (x) sin (x) = 0

Rewrite using trig identities

- 1 + 2 cos (x) sin (x)

Use the Double Angle identity:

2 sin (x) cos (x) = sin (2 x)

= - 1 + sin (2 x)

- 1 + sin (2 x) = 0

Move

1

to the right side

- 1 + sin (2 x) = 0

Add

1

to both sides

- 1 + sin (2 x) + 1 = 0 + 1

Simplify

sin (2 x) = 1

sin (2 x) = 1

General solutions for

sin (2 x) = 1

sin (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

2 x = \frac{π}{2} + 2 πn

2 x = \frac{π}{2} + 2 πn

Solve

2 x = \frac{π}{2} + 2 πn : x = \frac{π}{4} + πn

2 x = \frac{π}{2} + 2 πn

Divide both sides by

2

2 x = \frac{π}{2} + 2 πn

Divide both sides by

2

\frac{2 x}{2} = \frac{\frac{π}{2}}{2} + \frac{2 πn}{2}

Simplify

\frac{2 x}{2} = \frac{\frac{π}{2}}{2} + \frac{2 πn}{2}

Simplify

\frac{2 x}{2} : x

\frac{2 x}{2}

Divide the numbers:

\frac{2}{2} = 1

= x

Simplify

\frac{\frac{π}{2}}{2} + \frac{2 πn}{2} : \frac{π}{4} + πn

\frac{\frac{π}{2}}{2} + \frac{2 πn}{2}

\frac{\frac{π}{2}}{2} = \frac{π}{4}

\frac{\frac{π}{2}}{2}

Apply the fraction rule:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{π}{2 \cdot 2}

Multiply the numbers:

2 \cdot 2 = 4

= \frac{π}{4}

\frac{2 πn}{2} = πn

\frac{2 πn}{2}

Divide the numbers:

\frac{2}{2} = 1

= πn

= \frac{π}{4} + πn

x = \frac{π}{4} + πn

x = \frac{π}{4} + πn

x = \frac{π}{4} + πn

x = \frac{π}{4} + πn

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Frequently Asked Questions (FAQ)

What is the general solution for (cos(x))/(csc(x))+(sin(x))/(sec(x))=1 ?
The general solution for (cos(x))/(csc(x))+(sin(x))/(sec(x))=1 is x= pi/4+pin