`sin163^@ cos347^@+sin73^@sin167^@=` (A) 0 (B) `1/2` (C) 1 (D) none of these

sin 163^0cos 347^0+sin 73^0sin 167^0= a. 1//2 b. 1 c. 0 d. none of these

Evaluate : sin163^@.cos347^@+sin73^@.sin167^@.

s in163^(0)cos347^(0)+s in73^(0)s in167^(0)=1/2 b.1 c.0 d.none of these

sin^-1 (cos(sin^-1(sqrt(3)/2))= (A) pi/3 (B) pi/6 (C) - pi/6 (D) none of these

sin^-1 (cos(sin^-1(sqrt(3)/2))= (A) pi/3 (B) pi/6 (C) - pi/6 (D) none of these

If cosA+cos^2A=1 , then sin^2A+sin^4A= (a) -1 (b) 0 (c) 1 (d) None of these

The value of sin^2(cos^(-1)(1/2) )+ cos^2(sin^(-1)(1/3)) is: (A) 17/36 (B) 59/36 (C) 36/59 (D) none of these

The value of the expression (1-4sin 10^0 sin 70^0)/(2sin 10^0 ) is- a.1/2 b. 1 c.2 d. none of these

The value of sin 78^0-sin 66^0-sin 42^0+sin6^0 is a. -1 b. 1//2 c. -1//2 d. none of these

If sinx+siny=sqrt(3)(cos y-cos x), then sin3x+sin3y= ___________ (a) 2sin3x (b) 0 (c) 1 (d) none of these