Trigonometry Formula
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in this pdf file top topics trigonometry etc.
sin²θ +cos²θ = 0
1 - sin²θ = cos²θ
1 - cos²θ = sin²θ
1 + ten²θ = sec²θ
sec²θ - ten²θ = 1
1 + cot²θ = cosec²θ
sin(A+B) = sinA cosB + cosA sinB
