The value of sin 180 is
  • $ \frac { \sqrt 5 -1}{4}$
  • $ \frac { \sqrt 5 +1}{4}$
  • $ \frac {1 - \sqrt 3}{4}$
  • $ \frac {1 + \sqrt 3}{4}$
The minimum value of cos (cos x) is
  • 0
  • -1
  • -cos 1
  • cos 1
if Sin A = 3/5 , 0 < A < $\frac {\pi}{2}$ and cos B= -12/13  , $\pi < B  < \frac {3 \pi}{2}$, then the value of tan (A  -B) is
  • 16/63
  • 15/63
  • 11/63
  • 12/37
The solutions of the trigonometric equation tan x + tan 2x + tan x tan 2x=1
  • $\frac {n \pi}{3} + \frac {\pi}{8}, n \in Z$
  • $\frac {n \pi}{3} + \frac {\pi}{4}, n \in Z$
  • $\frac {n \pi}{2} + \frac {\pi}{12}, n \in Z$
  • $\frac {n \pi}{3} + \frac {\pi}{12}, n \in Z$
if x and y be real, then the equation has solution $sin ^2 \theta = \frac {x^2 + y^2}{2xy}$
  • Only when $x=y \ne 0$
  • For all x and y
  • for no x and y
  • Only when $x \ne y \ne 0$
which of these is not the solution for the equation $7 cos^2 x + 3 sin^2 x =4$
  • $\frac {4 \pi}{3}$
  • $\frac {11 \pi}{3}$
  • $\frac {2 \pi}{3}$
  • $\frac {4 \pi}{5}$
which of these is incorrect?
  • $ sin 3 A = 3 sin A + 4 sin^3 A$
  • $cos 3 A =4 cos^3 A – 3 Cos A$
  • $ cos 2 A = \frac {1 – tan^2 A}{1 + tan^2 A}$
  • $ sin 2 A = \frac {2 tan A}{1 + tan^2 A}$
The value of cos 1° cos 2° cos 3° ... cos 179° is
  • 1
  • 1/2
  • -1
  • 0
0 h : 0 m : 1 s

Answered Not Answered Not Visited Correct : 0 Incorrect : 0