Question

find the value of cos^-1(cos9π/4)​

Answer 1

Step-by-step explanation:

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Answer 2

SOLUTION

TO DETERMINE

The value of

$\displaystyle \sf{ { \cos}^{ - 1} \bigg( \cos \frac{9\pi}{4} \bigg) }$

EVALUATION

$\displaystyle \sf{ { \cos}^{ - 1} \bigg( \cos \frac{9\pi}{4} \bigg) }$

$\displaystyle \sf{ = { \cos}^{ - 1} \Bigg[ \cos \bigg(2\pi + \frac{\pi}{4} \bigg) \Bigg]}$

$\displaystyle \sf{ = { \cos}^{ - 1} \Bigg[ \cos \frac{\pi}{4} \Bigg]}$

$\displaystyle \sf{ = \frac{\pi}{4} }$

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