First slide

Trigonometric transformations

Question

$\cos 48 ° . \cos 12 ° = \frac{\sqrt{5} + 3}{λ} .$ Then $λ =$

Moderate

A

8
B

1
C

2
D

3

Solution

Multiply and divide by 2 and 2 CosA.CosB=
$C o s (A + B) + C o s (A - B)$

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