Trigonometry Quiz 7

sin (A + B) cos (A – B) + sin (A – B) cos (A + B) =

If sin A = cos B, then A + B =

The value of cos 36° cos 54° – sin 36° sin 54° =

The value of $\frac{1}{1+cos\theta} + \frac{1}{1-cos\theta}$ =

The value of $tan^2 \theta + tan^4 \theta$ is

The value of cos $45^\circ$. cos $30^\circ$. cos $90^\circ$. cos $60^\circ$ = 

If x = a cosec$\theta$ and y = a cot$\theta$, then which of the following is true ?

If sin A= $\frac{7}{25}$,then cot A =

cos 12° – sin 78° = …………

If x = cosec θ + cot θ,.y = cosec θ – cot θ, then which of the following is true ?