First slide

Trigonometric Identities

Question

If $a = \sin 170^{0} + \cos 170^{0}$ then

Moderate

A

$a > 0$
B

$a < 0$
C

$a = 0$
D

$a = 1$

Solution

$a = \sin 170^{0} + \cos 170^{0}$ $= \sin 10^{0} - \cos 10^{0} < 0$

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