Evaluate cos²42°-sin²48°
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Answered by
4
Answer:
0
Step-by-step explanation:
cos²42°-sin²48°
= sin²48° - sin²48°
= 0
Answered by
3
Answer:
0
Step-by-step explanation:
cos²42°-sin²48°
we know that cos theta = sin(90 - theta)
cos²42°-sin²48°
sin^2(90-42) - sin^2 48
sin^2 48 - sin^2 48
=0
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