cos-x-60-cos-x-30-sin-x-prove-

Question Number 68446 by 9102176137086 last updated on 10/Sep/19

\cos (x - 60) + \cos (x - 30) = \sin x

p r o v e

Commented by mr W last updated on 10/Sep/19

n o t t r u e!

f o r x = 30 ° :

\cos (30 - 60) + \cos (30 - 30)

= \cos 30 + 1

= \frac{\sqrt{3}}{2} + 1

b u t \sin 30 = \frac{1}{2}

\Rightarrow L H S \neq R H S

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