Trigonometric Functions

In a triangle ABC, BC = 7, AC = 8, AB = N and = 23. If 49 (3C) + 42 = mn, where (m, n) = 1, then m + n is equal to .

Suppose [0, 4 ] is a solution of 4 - 3 = 1. Then is equal to :

1. 6 - 6(3 6 - 2)
2. 4(3 6 + 2)
3. 6 + 6(3 6 + 2)
4. 4(3 6 - 2)

The number of solutions of 2 x + (2 + 2x - x2 ) x - 3(x - 1)2 = 0, where - x , is .

If = 1 x(x2+x+1), = x x2+x+1 and = (x-3+x-2+x-1 )1/2, 0<A, B, C< 2, then A+B is equal to :

1. C
2. -C
3. 2 -C
4. 2-C

The number of solutions of the equation 4 2 x-4 3 x+9-4 x=0 ; x [-2 , 2 ] is :

1. 0
2. 3
3. 1
4. 2

The number of solutions, of the equation e x-2e- x=2, is :

1. 0
2. 1
3. 2
4. more than 2

If 2 3 x+ 2x x+4 x-4=0 has exactly 3 solutions in the interval [0, n 2 ], n N, then the roots of the equation x2+nx+(n-3)=0 belong to :

1. (0, )
2. Z
3. (- 172, 172 )
4. (- , 0)

For , (0, /2), let 3 ( + )=2 ( - ) and a real number k be such that =k . Then, the value of k is equal to

1. 5
2. -2/3
3. -5
4. 2/3

If ,- 2< < 2 is the solution of 4 +5 =1, then the value of is

1. 10- 1012
2. 10-106
3. 10-1012
4. 10- 106

The sum of the solutions x R of the equation 3 2x+ 3 2x 6 x- 6 x=x3-x2+6 is

1. 3
2. 1
3. 0
4. -1