Multiple choice questions I — task. Mathematics State Board, Class 9.

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1. If

$sin \ 30^{\circ} = x$ and

$cos \ 60^{\circ} = y$ , then

$x^2 + y^2$ is

$\frac{1}{2}$
$cos \ 90^{\circ}$
$0$
$sin \ 90^{\circ}$

2. If

$tan \ \theta = cot \ 37^{\circ}$ , then the value of

$\theta$ is .

3. The value of

$tan \ 72° \ tan \ 18°$ is .

4. The value of

$\frac{2 tan 30^{\circ}}{1 - tan^2 30^{\circ}}$ is equal to .

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