First slide

Trigonometric transformations

Question

$A + B + C = 180 ° \Rightarrow \cos 2 A + \cos 2 B + \cos 2 C =$

Moderate

A

$1 - 4 \sin A \sin B \sin C$
B

$1 + 4 \sin A \sin B \sin C$
C

$1 + 4 \cos A \cos B \cos C$
D

$- 1 - 4 \cos A \cos B \cos C$

Solution

Put $A = B = C = 60 °$ and verify

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App