Unit Test: Class X

cot(A+B) =

• $\frac{\cot A\cot B-1}{\cot A+\cot B}$

• $\frac{\cot A\cot B+1}{\cot A-\cot B}$

• $\frac{\cot A\cot B-1}{\cot B-\cot A}$

• NONE OF THESE
  
  

1+Cos14x

• $\cos^27x$

• $2\cos^27x$

• $2\sin^214x$

• $\sin^23x$

 $\sin3\theta\ =$  

•  $4\sin^3\theta-3\sin\theta$  

•  $3\sin\theta+4\sin^3\theta$  

•  $3\sin\theta-4\sin^3\theta$  

•  $4\sin^3\theta+3\sin\theta$  

Tags

CCSS.HSF.TF.C.9

 $\sin2\alpha=$  

•  $\frac{2\tan\alpha}{1-\tan^2\alpha}$  

•  $\frac{2\tan\alpha}{1+\tan^2\alpha}$  

•  $\frac{1+\tan^2\alpha}{1-\tan^2\alpha}$  

•  $\frac{1-\tan^2\alpha}{1+\tan^2\alpha}$  

Tags

CCSS.HSF.TF.C.9

 $\sqrt{\frac{1-\cos2\theta}{1+\cos2\theta}}\ =$  

•  $\cot\theta$  

•  $\tan\theta$  

•  $\sin\theta$  

•  $\cos\theta$  

Which one is the false statement about half angle ?

• $\cos\theta=\cos^2\ \frac{\theta}{2}-\sin^2\ \frac{\theta}{2}$

• $\sin\theta=2\sin\ \frac{\theta}{2}\cos\ \frac{\theta}{2}$

• $\tan\theta=\frac{2\tan\ \frac{\theta}{2}}{1-\tan^2\ \frac{\theta}{2}}$

• $\cos\theta=1+2\sin^2\ \frac{\theta}{2}$

If the obtuse angle between two straight is 120 degree, what the the acute angle between the straight lines?

• 30 degree

• 70 degree

• 60 degree

• 120 degree

What is the angle between the lines represented by the equations x=0 and y= 0?

• 120 degree

• 60 degree

• 30 degree

• 90 degree

If the line represented by ax+by+c =0 is parallel to y= mx+c, what is the value of 'm'in term of 'a' and 'b'?

• $m=\ \frac{a}{b}$

• $m=\ \frac{b}{a}$

• $m=\ -\frac{a}{b}$

• $m=\ -\frac{b}{a}$

which of the following line is perpendicular to the line represented by ax+by+c= 0?

• ax+by+k=0

• bx+ay+k =0

• bx-ay+k=0

• ax - by +k 0