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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
Can someone give a quick rundown on trig reduction formulas? And these examples? - Quora
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How to find the value of sin (-11 pi/2) and cos 6 pi using very simple method - Quora
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Trigonometric Addition Formulas -- from Wolfram MathWorld
How to prove that trigonometric reduction formulas work for every angle - Quora