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India
Class X

Simplify expressions with reciprocals using complementary results

Interactive practice questions

Fill in the blank with the acute angle that makes the statement true.

$\sin$sin$\editable{}$°$=$=$\cos25^\circ$cos25°

Easy
< 1min

Complete the blank in the following expression:

Easy
< 1min

Rewrite $\cos37^\circ$cos37° in terms of its cofunction.

Easy
1min

Rewrite $\sin76^\circ$sin76° in terms of its cofunction.

Easy
< 1min
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Outcomes

10.T.IT.1

Trigonometric ratios of an acute angle of a right-angled triangle. Proof of their existence (well defined); motivate the ratios, whichever are defined at 0° and 90°. Values (with proofs) of the trigonometric ratios of 30°, 45° and 60°. Relationships between the ratios.

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