What is the value of (0.3)(0.03)cos(90) ?

The value of (0.3)(0.03)cos(90) is 0

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(0.3)(0.03)cos(90)

(0.3) (0.03) cos (9 0^{\circ})

0

Solution steps

(0.3) (0.03) cos (9 0^{\circ})

= \frac{3}{10} \cdot \frac{3}{100} cos (9 0^{\circ})

Use the following trivial identity:

cos (9 0^{\circ}) = 0

cos (9 0^{\circ})

cos (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} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{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} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= 0

= \frac{3}{10} \cdot \frac{3}{100} \cdot 0

Simplify

\frac{3}{10} \cdot \frac{3}{100} \cdot 0 : 0

\frac{3}{10} \cdot \frac{3}{100} \cdot 0

Multiply fractions:

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

= 0 \cdot \frac{3 \cdot 3}{10 \cdot 100}

\frac{3 \cdot 3}{10 \cdot 100} = \frac{9}{1000}

\frac{3 \cdot 3}{10 \cdot 100}

Multiply the numbers:

3 \cdot 3 = 9

= \frac{9}{10 \cdot 100}

Multiply the numbers:

10 \cdot 100 = 1000

= \frac{9}{1000}

= 0 \cdot \frac{9}{1000}

Apply rule

0 \cdot a = 0

= 0

= 0

\frac{1}{cos ^{2} ( π )}

cos (arcsin (\frac{5}{6}) + arctan (\frac{4}{3}))

csc (2 7^{\circ})

sin^{2} (1 6^{\circ})

sec (24 5^{\circ})