What is the value of cos(0)*cos(0) ?

The value of cos(0)*cos(0) is 1

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cos(0)*cos(0)

cos (0) \cdot cos (0)

1

Solution steps

cos (0) cos (0)

Use the following trivial identity:

cos (0) = 1

cos (0)

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

= 1

= 1 \cdot 1

Simplify

= 1

cos (\frac{5}{4}) π

arctan (\frac{- 5}{8})

\frac{1.5 \cdot 25}{cos ( 16.8 2 ^{\circ} )}

tan^{2} (\frac{π}{4}) + 2 cos (\frac{8 π}{3}) - sin (\frac{13 π}{6})

arcsin (\frac{0.43}{0.82})