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Answer:
cot x
Step-by-step explanation:
f ( x ) = sin x + cos x
f ( - x ) = - sin x + cos x = cos x - sin x
[ f ( x ) + f ( - x ) ] / [ f ( x ) - f ( - x ) ]
= > [ sin x + cos x + cos x - sin x ] / [ sin x + cos x - cos x + sin x ]
= > 2 cos x / 2 sin x
= > cos x / sin x
= > cot x
The value will be cot x .
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