1.

$\alpha +\beta$ =$90^{0}$ , then the expression $\frac{tan\alpha}{tan\beta} + sin^{2}\alpha+sin^{2}\beta $ is equal to1). $sec^{2}\beta$2). $tan^{2}\alpha$3). $tan^{2}\beta$4). $sec^{2}\alpha$

Answer»

I am not SURE, MAY be $SEC^{2}\alpha$ is CORRECT



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