`sin{2\ cos^(-1)(-3/5)}` is equal to `6//25` (b) `24//25` (c) `4//5` (d) `-24//25`

sin{2\ cos^(-1)(-3/5)} is equal to (a) 6//25 (b) 24//25 (c) 4//5 (d) -24//25

The value of cos[2tan^(-1)(-7)] is :a) 49/50 b) -49/50 c) 24/25 d) -24/25

(1)/(0.04) is equal to (1)/(40) (b) (2)/(5)(c)2.5(d)25

((-2)/5)^7-:((-2)/5)^5 is equal to 4/(25) (b) (-4)/(25) (c) ((-2)/5)^(12) (d) (25)/4

((-2)/5)^7-:((-2)/5)^5 is equal to (a) 4/(25) (b) (-4)/(25) (c) ((-2)/5)^(12) (d) (25)/4

In Delta ABC if r_1=2r_2=3r_3 and D is the mid point of BC then Cos/_ADC is (a) 7/25 (b) -7/25 (c) 24/25 (d) -24/25

I. sin("Cos"^(-1)3/5)=4/5 II. cos("Tan"^(-1)7/24)=24/25

int_(0)^(1) xe^(-5x) dx is equal to a) (1)/(25) - (6e^(-5))/(25) b) (1)/(25) + (6e^(-5))/(25) c) -(1)/(25) - (6e^(-5))/(25) d) (1)/(25) - (1)/(5) e^(-5)

If sum_(r=0)^(n){("^(n)C_(r-1))/('^(n)C_(r )+^(n)C_(r-1))}^(3)=(25)/(24) , then n is equal to (a) 3 (b) 4 (c) 5 (d) 6

If sum_(r=0)^(n){("^(n)C_(r-1))/('^(n)C_(r )+^(n)C_(r-1))}^(3)=(25)/(24) , then n is equal to (a) 3 (b) 4 (c) 5 (d) 6