Example problems III — task. Mathematics CBSE, Class 10.

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Consider

$\triangle ACB$ , right-angled at

$C$ , in which

$AB = 29 \ \text{units}$ ,

$BC = 21 \ \text{units}$ and

$\angle ABC = \theta$ .

Determine the values of:

(i)

$cos^2 \ \theta + sin^2 \ \theta =$

(ii)

$cos^2 \ \theta - sin^2 \ \theta =$

$\frac{i}{i}$

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