1.

Cos A (1 + cot A) + sin A (1 + tan A)= sec A + cosec A

Answer»

Step-by-step EXPLANATION:

\cos(a) (1 +  \cot(a) ) +  \sin(a)(1 +  \tan(a)  ) \\  \cos(a)  \csc(a)  +  \sin(a)  \sec(a)  \\  \sec(a)  +  \csc(a)



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