Question

Evaluate cos 48 degree -sin42 degree +sin 90degree

Answer 1

Answer:1

Step-by-step explanation:

Cos 48 -sin 42+sin 90

Where cosA=sin (90-A)

So cos 90-42-sin42+sin 90

Sin 42-sin 42+ sin 90

Sin and - Sin gets cancelled

Sin 90 =1 ( identity)

So we leftover with

+1=1

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