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Trigonometric Functions

Multiple Choice Questions

171.

$\tan (θ) + \cot (θ) = 2$ = 2, then $\sin (θ)$ is equal to

$\frac{1}{\sqrt{2}}$
$\frac{1}{\sqrt{3}}$
$\frac{1}{2}$
1

172.

$If θ = \frac{π}{6}, then the 10 th term of 1 + (\cos (θ) + isin (θ)) + {(\cos (θ) + isin (θ))}^{2} + {(\cos (θ) + isin (θ))}^{3} + . . . is equal to$

$i$
- 1
1
$- i$

173.
$\frac{\sin (5 θ)}{\sin (θ)} is equal to$

$16 c o s^{4} (θ) - 12 c o s^{2} (θ) + 1$

$16 \cos^{4} (θ) + 12 \cos^{2} (θ) + 1$

$16 \cos^{4} (θ) - 12 \cos^{2} (θ) - 1$

$16 \cos^{4} (θ) + 12 \cos^{2} (θ) - 1$

$16 c o s^{4} (θ) - 12 c o s^{2} (θ) + 1$

$\frac{\sin (5 θ)}{\sin (θ)} = \frac{\sin (3 θ + 2 θ)}{\sin (θ)} = \frac{\sin (3 θ) \cos (2 θ) + \cos (3 θ) \sin (2 θ)}{sinθ} = \frac{(3 \sin (θ) - 4 \sin (^{3} θ)) (\cos (2 θ)) + 2 \cos (3 θ) . \sin (θ) \cos (θ)}{\sin (θ)} = (3 - 4 \sin^{2} (θ)) (2 \cos^{2} (θ) - 1) + 2 \cos (θ) (4 \cos^{3} (θ) - 3 \cos (θ)) = [3 - 4 (1 - \cos^{2} (θ))] (2 \cos^{2} (θ) - 1) + 8 \cos^{4} (θ) - 6 \cos^{2} (θ) = [4 \cos^{2} (θ) - 1] (2 \cos^{2} (θ) - 1) + 8 \cos^{4} (θ) - 6 \cos^{2} (θ) = 8 \cos^{4} (θ) - 6 \cos^{2} (θ) + 1 + 8 \cos^{4} (θ) - 6 \cos^{2} (θ) + 1 = 16 \cos^{4} (θ) - 12 \cos^{2} (θ) + 1$

174.

$\cos^{2} (\frac{π}{6} + θ) - \sin^{2} (\frac{π}{6} + θ) is equal to$

$\frac{1}{2} \cos (2 θ)$
0
$- \frac{1}{2} \cos (2 θ)$
$\frac{1}{2}$

175.

$In ∆ ABC, \frac{\cos (C) + \cos (A)}{c + a} + \frac{\cos (B)}{b} is equal to$

$\frac{1}{a}$
$\frac{1}{b}$
$\frac{c + a}{b}$
1

176.

$In ∆ ABC, \frac{a}{b^{2} - c^{2}} + \frac{c}{b^{2} - a^{2}} = 0, then B is equal to$

$\frac{π}{2}$
$\frac{π}{4}$
$\frac{2 π}{3}$
$\frac{π}{3}$

177.

$In ∆ ABC, a^{2} \sin (2 C) + c^{2} \sin (2 A) is equal to$

$∆$
$2 ∆$
$3 ∆$
$4 ∆$

178.

$The shadow of a tower standing on a level ground is found to be 60 m longer when the sun' s altitude is 30 ° than when it is 45 ° . The height of the tower is$

$30 m$
$90 m$
$60 \sqrt{3} m$
$30 (\sqrt{3} + 1) m$

179.

$If cosecθ = \frac{p + q}{p - q}, then \cot (\frac{π}{4} + \frac{θ}{4}) is equal to$

$\frac{\sqrt{p}}{q}$
$\sqrt{\frac{q}{p}}$
$\sqrt{pq}$
$pq$

180.

From a point on the level ground, the angle of elevation of top of a pole is $30 °$ on moving 20metres nearer,the angle of elevation is $45 °$ . Then,the height of the pole $(in metres)$ , is

$10 (\sqrt{3} - 1)$
$10 (\sqrt{3} - 1)$
15
20

Previous Year Papers

Test Series

Test Yourself

Multiple Choice Questions

173. sin5θsinθ is equal to 16cos4θ - 12cos2θ + 1 16cos4θ+ 12cos2θ + 1 16cos4θ - 12cos2θ - 1 16cos4θ + 12cos2θ - 1

173.
$\frac{\sin (5 θ)}{\sin (θ)} is equal to$

$16 c o s^{4} (θ) - 12 c o s^{2} (θ) + 1$

$16 \cos^{4} (θ) + 12 \cos^{2} (θ) + 1$

$16 \cos^{4} (θ) - 12 \cos^{2} (θ) - 1$

$16 \cos^{4} (θ) + 12 \cos^{2} (θ) - 1$