1.

If  cotθ =7/8, evaluate (1– cosθ )(1+ cosθ )/(1– sinθ  )(1+ sinθ)

Answer»

(1– cosθ)(1+ cosθ )/(1– sinθ)(1+ sinθ) 

= (1 -cos2θ/1-sin2θ) = tanθ

= 64/49.



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