1.

sec xdxcosec2x

Answer»

∫(sec^2x/cosec^2x)dx​∫(1/cos​​^2x)/(1/sin^2x)dx

∫(1/cos​^2xsinx) . (sin^2x/1)dx

∫tan^2x dx

∫(sec^2x-1) dx

tanx - x + c

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