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India
Class XI

Trigonometric ratios of obtuse angles

Interactive practice questions

Write the following trigonometric ratio using an acute angle:

$\sin147^\circ$sin147°

Easy
< 1min

Write the following trigonometric ratio using an acute angle:

$\cos165^\circ$cos165°

Easy
< 1min

Write the following trigonometric ratio using an acute angle:

$\tan157^\circ$tan157°

Easy
< 1min

Evaluate $\sin146^\circ$sin146° correct to two decimal places and make note of the sign of your answer.

Easy
< 1min
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Outcomes

11.SF.TF.2

Identities related to sin 2x, cos 2x, tan 2x, sin 3x, cos 3x and tan 3x. General solution of trigonometric equations of the type sin θ = sin α, cos θ = cos α and tan θ = tan α. Proofs and simple applications of sine and cosine formulae.

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