For the equation `cos^(-1)x+cos^(-1)2x+pi=0` , the number of real solution is (A)1 (B) 2 (C) 0 (D) `oo`

For the equation cos^(-1) x + cos^(-1) 2x + pi=0 , the number of real solutions is a)1 b)2 c)0 d) oo

The number of solutions of cos^(-1)x=e^(x)(A)1(B)2(C)3(D)0

The equation cos^(8)x+b cos^(4)x+1=0 will have a solution if b belongs to (A)(-oo,2] (B) [2,oo](C)[-oo,-2](D) none of these

The number of solutions of the equation cos6x+tan^2x+cos(6x)tan^2x=1 in the interval [0,2pi] is (a) 4 (b) 5 (c) 6 (d) 7

The number of solutions of the equation cos6x+tan^2x+cos(6x)tan^2x=1 in the interval [0,2pi] is (a) 4 (b) 5 (c) 6 (d) 7

The number of solutions of the equation cos6x+tan^2x+cos(6x)tan^2x=1 in the interval [0,2pi] is (a) 4 (b) 5 (c) 6 (d) 7

The number of real solutions of cos^(-1)x+cos^(-1)2x=-pi is

The number of solutions of the equation cos6x+tan^2x+cos6xtan^2x=1 in the interval [0,2pi] is 4 (b) 5 (c) 6 (d) 7

The equation cos^8x+bcos^4x+1=0 will have a solution if b belongs to (A) (-oo,2] (B) [2,oo] (C) [-oo,-2] (D) none of these