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Mathematics, 10.06.2021 19:00 amesha62

\frac{1+siny}{cos y}+\frac{cos y}{1+sin y} \frac{cot x}{tanx+cot x}=cos^2x

csc^2θ·tan^2θ - 1 = tan^2θ

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csc^2θ·tan^2θ - 1 = tan^2θ...
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