Trigonometric Functions · Question 4

If A= 3 9 + 9 27 + 27 81 and B= 81 - 3 , then BA is equal to .

If ( 18 ) ( 5 18 ) ( 7 18 )=K, then the value of ( 10K 3 ) is :

1. 3+12 2
2. 3-1 2
3. 32
4. 12

Let S=\x [- , ] : x( x+ x)=a, a Z\. Then n(S) is equal to :

1. 3
2. 6
3. 7
4. 9

Let P=\ [0, 4 ] : 2 1\ and S=\a Z : 2( 8 - 8 ) 2 =a2, P\. Then n(S) is:

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

If (A - B) A + 2 C 2 A = 1, A, B, C (0, 2 ), then

1. A, C, B are in A.P.
2. A, C, B are in G.P.
3. A, B, C are in G.P.
4. A, B, C are in A.P.

The sum of all the elements in the range of f(x) = Sgn( x) + Sgn( x) + Sgn( x) + Sgn( x), x n 2, n Z, where Sgn(t) = cases 1, & if t > 0 \ -1, & if t < 0 cases is :

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

The value of 3 cosec 20 - 20 20 40 60 80 is equal to

1. 32
2. 64
3. 12
4. 16

If x = 512 for some x ( , 3 2 ), then 7x ( 13x2 + 13x2 ) + 7x ( 13x2 - 13x2 ) is equal to

1. 5 13
2. 6 26
3. 4 26
4. 1 13

The number of elements in the set \x [0, 180 ] : (x + 100 ) = (x + 50 ) x (x - 50 )\ is .

Number of solutions of 3 2 + 8 + 3 3 = 0, [-3 , 2 ] is :

1. 5
2. 4
3. 3
4. 0