First slide

Trigonometric Identities

Question

$\cos^{3} 240^{0} + \cos^{3} 390^{0} + \cos^{3} 450 =$

Moderate

A

0.52
B

0.60
C

0.55
D

0.51

Solution

$\cos^{3} 240^{0} + \cos^{3} 390^{0} + \cos^{3} 450 = - \frac{1}{8} + \frac{3 \sqrt{3}}{8} + 0 = 0.52$

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