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Popular >

sin(720)

Solution

sin (72 0^{\circ})

Solution

0

Solution steps

sin (72 0^{\circ})

sin (72 0^{\circ}) = sin (0)

sin (72 0^{\circ})

Rewrite

72 0^{\circ}

as

36 0^{\circ} \cdot 2 + 0

= sin (36 0^{\circ} 2 + 0)

Apply the periodicity of

sin

:

sin (x + 36 0^{\circ} \cdot k) = sin (x)

sin (36 0^{\circ} \cdot 2 + 0) = sin (0)

= sin (0)

= sin (0)

Use the following trivial identity:

sin (0) = 0

sin (0)

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= 0

= 0

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\frac{tan ( 2 5 ^{\circ} ) + tan ( 11 0 ^{\circ} )}{1 - tan ( 2 5 ^{\circ} ) tan ( 11 0 ^{\circ} )}

Frequently Asked Questions (FAQ)

What is the value of sin(720) ?
The value of sin(720) is 0