K. I understood. Btw thank u so much.

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So kind of u. U spent ur time to help me. Thnk u so so so much....☺️

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Lol. Btw thank u.

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K. I understood. Btw thank u so much.

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So kind of u. U spent ur time to help me. Thnk u so so so much....☺️

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Lol. Btw thank u.

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cos θ/cos(90- θ)=cos θ/sin θ.........................cos(90- θ)=sin θ

adding both of these equation and taking lcm

we get

sin^2 θ+cos^2 θ/sin θcos θ

and we know that

sin^2 θ+cos^2 θ=1

now we have

1/sin θcos θ=sec θcosec θ

taking rhs we get

sec θ=1/cos θ and cosec θ=1/sin θ

so

1/sin θcos θ=sec θcosec θ

hence proved