First slide

Trigonometric transformations

Question

If $A + B + C = 270 °,$ then $\cos 2 A + \cos 2 B + \cos 2 C + 4 \sin A \sin B \sin C =$

Moderate

A

0
B

1
C

2
D

3

Solution

Use $C o s C + C o s D$ formulae

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