what is the formula of trigonometry
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The trigonometry formulas for trigonometry ratios when the angles are in addition are given as, sin(x + y) = sin(x)cos(y) + cos(x)sin(y) cos(x + y) = cos(x)cos(y) - sin(x)sin(y) tan(x + y) = (tan x + tan y)/(1 - tan x • tan y)
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Pythagorean Identities
sin²θ + cos²θ = 1
tan2θ + 1 = sec2θ
cot2θ + 1 = cosec2θ
sin 2θ = 2 sin θ cos θ
cos 2θ = cos²θ – sin²θ
tan 2θ = 2 tan θ / (1 – tan²θ)
cot 2θ = (cot²θ – 1) / 2 cot θ
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