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

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Proof of the reduction Formulas. Reduction Formulas for the trig functions of angles (90°+α) or (π/2+α). Right-angled triangle properties. Shifting by pi/2

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

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