NDA MATHEMATICS QUIZ - 23

Attempt now to get your rank among 5 students!

Question 1:

$\operatorname{cosec} \theta-2 \cot 2 \theta \cdot \cos \theta=.......$

Question 2:

$\frac{4 \cos 2 x}{(\sin 2 x)^{2}}$ is equal to.

Question 3:

Which of the following is correct?

Question 4:

Value of $\cos ^{4} \frac{\pi}{8}+\cos ^{4} \frac{3 \pi}{8}+\cos ^{4} \frac{5 \pi}{8}+$ $\cos ^{4} \frac{7 \pi}{8}$ is equal to.

Question 5:

$\cos ^{2} \frac{\pi}{9}+\cos ^{2} \frac{2 \pi}{9}+\cos ^{2} \frac{4 \pi}{9}$ is equal to.

Question 6:

$\left(1+\cos \frac{\pi}{8}\right)\left(1+\cos \frac{3 \pi}{8}\right)\left(1+\cos \frac{5 \pi}{8}\right)$ $\left(1+\cos \frac{7 \pi}{8}\right)=........$

Question 7:

If $\cot \theta=\left(\frac{b}{a}\right)$ then $(a \cos 2 \theta+b \sin 2 \theta)$ is independent of

Question 8:

If $\sin 25^{\circ}+\cos 25^{\circ}=\lambda$ then $\cos 20^{\circ}$ will be equal to

Question 9:

$\cos \frac{6 \pi}{7}+\cos \frac{4 \pi}{7}+\cos \frac{2 \pi}{7}=......$

Question 10:

Value of $\frac{1-4 \sin 10^{\circ} \cdot \sin 70^{\circ}}{2 \sin 10^{\circ}}$ equals.

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