Question

Find the value of cos 765°​

Answer 1

Answer:

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Step-by-step explanation:

Cos 765° = cos ( 8×90° + 45°) = cos 45° = 1 / root 2

Answer 2

We know that cosine function is

periodic with period 2π.

∴ cos 765°

= cos(720° + 45°)

= cos(2 × 360° + 45°)

= cos 45°

$= \frac{1}{ \sqrt{2} }$

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