1- 2 A -cosec2 A is valid forA- 0 A - 90B- 0 A 90C- 0 - A 90 D- 0 - A - 90

The correct option is A 0 A 90 cosec A and cot A are not defined for A = 0^∘ but exists for any other value of A from 0^∘ to 90^∘ ...

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1+ 2 A =cosec...

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1 + $c o t^{2} A$ = $c o s e c^{2} A$ is valid for

0 A 90

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0 A 90

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0 A 90

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0 A 90

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