Question

prove that→→→→→→→→→→→→→→→→→→→→→

Answer 1

Convert the second pair of cos terms to sin form and then use the identity
$\cos( \alpha - \beta ) = \cos( \alpha ) \cos( \beta ) + \sin( \alpha ) \sin( \beta )$
To get the final answer as
$\cos(67.24 - 7.24) = \cos(60) = \frac{1}{2}$

Answer 2

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Step-by-step explanation:

Convert the second pair of cos terms to sin form and then use the identity