" 5."cot4 theta=cot theta

If theta = 9^(@), then what is the value of cot theta cot 2 theta cot 3 theta cot 4 theta cot 5 theta cot 6 theta cot 7 theta cot 8 theta cot 9 theta ?

Prove that: cot theta cot2 theta+cot2 theta cot3 theta+2=cot theta(cot theta-cot3 theta)

If 0 < 4theta < pi,"then the value of" cot theta - cot 4 theta "will be"-

tan theta + 2 tan 2 theta + 4 tan 4 theta + 8 cot 8 theta = cot theta.

tan theta + 2 tan 2 theta + 4 tan 4 theta + 8 cot 8 theta = cot theta.

Find cos theta, if 6 cot theta+2 "cosec" theta= cot theta+5 "cosec" theta .

tan theta+2tan2 theta+4cot4 theta=cot theta

Prove that cot theta cot 2 theta+ cot 2 theta cot 3 theta+ 2= cot theta (cot theta- cot 3 theta) .

prove that cot theta.cot2 theta+cot2 theta*cot3 theta+2=cot theta(cot theta-cot3 theta)

If cot^4theta-cot^2 theta = 1 then show that sec^4 theta-sec^2 theta=1 .