First slide

Trigonometric Identities

Question

$(\cos 420^{0} - \sin 390^{0}) (\cos 420^{0} + \sin 390^{0}) (\sin^{2} 240^{0} + \sin 390^{0} + \sin^{2} 60^{0}) =$

Moderate

A

1
B

0
C

2
D

3

Solution

$(\frac{1}{4} - \frac{1}{4}) (\frac{3}{4} + \frac{1}{4} + \frac{3}{4})$ =0

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