Question 697438
a)    (1- cos^2 theta)(1+ cot^2 (theta)= 1

{{{(1-cos^2(theta))*(1+cot^2(theta))}}}

{{{(sin^2(theta))*(cosec^2(theta))}}}



{{{sin^2(theta)*(1/sin^2(theta))}}}

=1








b)    tan^2 theta times cos^2 theta + cot^2 theta times sin^2 theta = 1