Trigonometric formulas
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https://goo.gl/images/nz6oge link of all formulates
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In terms of x, sec2x = sec^2x /(2- sec^2x)
cot2x = (cot^2x -1)/ 2 cotx
cot3x = (3cotx - cot^3x)/(1 - 3cot^2x)
cot2x = (cot^2x -1)/ 2 cotx
cot3x = (3cotx - cot^3x)/(1 - 3cot^2x)
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