Question

step by step explanation​

Answer 1

SOLUTION

$= > f(x) = cos \: x - sin \:x \\ \\ = > f( \frac{\pi}{2} ) = cos \: \frac{\pi}{2} - sin \: \frac{\pi}{2} \: \: \: (cos \: \frac{\pi}{2} = 0 )\: \: or \: (sin \: \frac{\pi}{2} = 1) \\ \\ = > 0 - 1 \\ = > - 1$

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Answer 2

Step-by-step explanation:

refer to the attachment...... ☺☺☺☺☺☺☺☺☺☺☺☺☺