1.

Given:(i)1-cot^2 theta =cosec^2 theta(ii)Is cos2 A +cos2 B=0then sin^2 A +sin^2 B =2(iii)tan2theta=(2tantheta)/(1-tan^2theta)(iv)sinx is periodic function with period pi/2Find which pair is true:

Answer»

(i) and (II) are TRUE
(i) and (IV)are true
(ii) and (III) are true
(iii) and (iv) are true

Answer :C


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