1.

.13. sec2 θ + cosec2 θ = sec2 θ cosec? θ.1+tan 2 θ14.m tan-θcoscc2 θ15., sec 0-1 sec θ+116, (1-cos2 θ) cosed 0-1.17, cos2 0.cosec θ + sin θ " cosec 0.

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