File:Sin a= cos (90-a) and cos a = sin (90-a).png - Wikimedia Commons

How do you find the exact value of sin(-90)?

value of sin 90 - Yahoo India Image Search results

cos(90-x)=sin(x) - Trigonometry

Proof of the reduction Formulas for angles (90°+α) or (π/2+α

Write the value of sintheta cos(90^(@)-theta)+costheta sin(90^(@)-the

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