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19. Two mark exercise problems IX

1. Find the value of

$\theta$ if

$cos \ \theta = 0.0410$

Answer:

$\theta =$

2. Find the value of

$\theta$ if

$tan \ \theta = 7.5958$

Answer:

$\theta =$

3. Verify

$1 + tan^2 \ 30^{\circ} = sec^2 \ 30^{\circ}$ .

Answer:

LHS:

$1 + tan^2 \ 30^{\circ} =$

$\frac{i}{i}$

RHS:

$sec^2 \ 30^{\circ} =$

$\frac{i}{i}$

Since LHS

$=$ RHS, then

$1 + tan^2 \ 30^{\circ} = sec^2 \ 30^{\circ}$ .

Hence, we proved.

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