TRIGONOMETRY CLASS XI

 $Which\ of\ the\ following\ cannot\ be\ the\ value\ of\ \cos\theta$  

• 1

• -1

• 0

•  $\sqrt{2}$  

 $Value\ of\ \sin7\pi\ is\$  

• 1

• 0

• -1

•  $\frac{1}{2}$  

The value of cosx in the 2nd quadrant

• increases from 0 to 1

• decreases from 0 to -1

• increases from -1 to 0

• decreases from 1 to 0

 $Value\ of\ \cos5\pi$  

Value of

• 1

• 0

• -1

•  $\frac{1}{\sqrt{2}}$  

 $Value\ of\ \sin\ \frac{41\pi}{4}\ is\$  

•  $\frac{1}{\sqrt{2}}$  

•  $-\frac{1}{\sqrt{2}}$  

•  $\frac{\sqrt{3}}{2}$  

•  $-\frac{\sqrt{3}}{2}$  

 $\tan x=-\frac{5}{12}$  

and  x lies in the 2nd quadrant , then the  value of sinx is

•  $\frac{5}{13}$  

•  $-\frac{5}{13}$  

•  $\frac{12}{13}$  

•  $-\frac{12}{13}$  

Value of cot1200⁰ is

• $\sqrt{3}$

• $\frac{1}{\sqrt{3}}$

• $-\sqrt{3}$

• $-\frac{1}{\sqrt{3}}$

Value of sec390⁰ is

• $2$

• $\frac{2}{\sqrt{3}}$

• $\frac{-2}{\sqrt{3}}$

• -2

 $Value\ of\ \frac{\cos135^0-\cos120^0}{\cos\ 135^0+\cos120^0}$  

•  $2+3\sqrt{2}$  

•  $3+2\sqrt{2}$  

•  $3-2\sqrt{2}$  

•  $2-3\sqrt{2}$  

Which of the following is correct?

• $\sin1^0>\sin1$

• $\sin1^0<\sin1$

• $\sin1^0=\sin1$

• $\sin1^0=\frac{\pi}{180}\sin1$