Value of `"cot"40^0dotcot 20^0(4sin 10^0-1)` is `-1` (b)1 (c) 2 (d) 0

The value of (tan55^0)/(cot35^0)+cot1^0cot2^0cot3^0cot90^0,i s -2 (b) 2 (c) 1 (d) 0

Value of (3+cot80^0cot20^0)/(cot80^0+cot20^0) is equal to (a) cot20^0 (b) tan50^0 (c) cot50^0 (d) cotsqrt(20^0)

cot16^0cot44^0+cot44^0cot76^0-cot76^0cot16^0 = (a) 1 (b) 2 (c) 3 (d) 4

The value of cos^2 10^0-cos10^0cos50^0+cos^2 50^0 is equal to 4/3 (b) 1/3 (c) 3/4 (d) 3

The value of sin 50^(0)-sin 70^0+sin 10^0 is equal to a. 0 b. 1 c. 2 d. 1//2

The number of solutions of the equation cot(sin x+3)=1, in [0,3pi] is 0 (b) 1 (c) 4 (d) 2

The value of cos^2 17^@ - sin^2 73^@ is (a) 1 (b) 1/3 (c) 0 (d) -1

If sinA+sin^2A=1, then the value of cos^2A+cos^4A is (a)2 (b) 1 (c) -2 (d) 0

The value of sin 78^0-sin 66^0-sin 42^0+sin6^0 is a. -1 b. 1//2 c. -1//2 d. none of these

Exact value of cos 20^0+2sin^2\ \ 55^0-sqrt(2)sin65^0\ is- a. 1 b. 1/(sqrt(2)) c. sqrt(2) d. zero