Class 10 - Introduction to Trignometry (Live Session)

If sinA = $\frac{1}{2}$ , then the value of cot A is :
1.   $\sqrt{3}$
2.   $\frac{1}{\sqrt{3}}$
3.   $\frac{\sqrt{3}}{2}$
4. 1

If $\sin θ = \frac{a}{b}$ , then $c o s θ$ is equal to
1.   $\frac{b}{\sqrt{b^{2} - a^{2}}}$
2.   $\frac{b}{a}$
3.   $\frac{\sqrt{b^{2} - a^{2}}}{b}$
4.   $\frac{a}{\sqrt{b^{2} - a^{2}}}$

If $\cos (α + β) = 0$ , then $\sin (α - β)$ can be reduced to :
1. cos $β$
2. cos 2 $β$
3. sin $α$
4. sin 2 $α$

If $\cos 9 α = \sin α$ and $9 α < 90 °$ , then the value of $\tan 5 α$ is:
1. $\frac{1}{\sqrt{3}}$
2. $\sqrt{3}$
3. 1
4. 0

If $∆ A B C$ is right-angled at C, then the value of cos (A + B) is :

1. 0
2. 1
3. $\frac{1}{2}$
4. $\frac{\sqrt{3}}{2}$

If $\sin A + \sin^{2} A = 1$ , then the value of $(\cos^{2} A + \cos^{4} A)$ is
1. 1
2. $\frac{1}{2}$
3. 2
4. 3

If $\sin α = \frac{1}{2}$ and $\cos β = \frac{1}{2}$ , then the value of $(α + β)$ is
1. 0 $°$
2. 30 $°$
3. 60 $°$
4. 90 $°$

If $\tan θ = 3$ , then $(\frac{4 \sin θ - \cos θ}{4 \sin θ + \cos θ})$ is equal to :
1.   $\frac{12}{13}$
2.   $\frac{11}{12}$
3.   $\frac{11}{13}$
4.   $\frac{13}{14}$

$\frac{\sin θ}{1 + \cos θ}$ + $\frac{1 + \cos θ}{\sin θ}$ =?
1. $2 cosθ$
2. $2 cosecθ$
3. $2 co t θ$
4. $\cos e c θ$

10.

$\frac{\tan A}{1 - s e c A} - \frac{\tan A}{1 + s e c A} = ?$
1. $2 cosA$
2. $2 cosecA$
3. $2 \cot A$
4. $2 secA$

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