Cos a sin (90°-a)+sin a cos (90°-a)
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Answer:
1
Step-by-step explanation:
cos(a)sin(90°-a)+sin(a)cos(90°-a)
= cos(a)cos(a)+sin(a)sin(a) (cos(90°-a)= sin(a) ; sin(90°-a) = cos(a))
=cos²a+sin²a
= 1
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