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

Sine and cosine are cofunctions of each other. The cosine of 90-x should be the same as the sine of x. This implies that graph of sine function is the same as shifting the graph of the cosine

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

If xsin(90^° theta) cot(90^° theta) = cos(90^° theta), then x is

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

How do you prove sin(90°-a) = cos(a)?

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

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