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`

The number of real solutions of |2x-x^2-3|=1 is (a) 0 (b) 2 (c) 3 (d) 4

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

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 the equation -x^2+x-1=sin^4x is (A) 1 (B) 2 (C) 0 (D) 4

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

The number of real solution of sin(e^x)=5^x+5^-x in [0,1] is (A) 0 (B) 1 (C) 2 (D) 4

The number of solution of equation |x-1|=e^x is (A) 0 (B) 1 (C) 2 (D) none of these

The value of a for which a x^2+sin^(-1)(x^2-2x+2)+cos^(-1)(x^2-2x+2)=0 has a real solution is pi/2 (b) -pi/2 (c) 2/pi (d) -2/pi

The number of solution of equation |x-1|= e^x is (A) 0 (B) 1 (C) 2 (D) none of these