Topics
Trigonometry
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India
Class XI

Solve problems involving exact value right triangles

Lesson
Practice

Interactive practice questions

Given that $\sin\theta=\frac{1}{2}$sinθ=12​, we want to find the value of $\cos\theta$cosθ.

a

First, find the value of $\theta$θ.

b

Hence, find the exact value of $\cos30^\circ$cos30°.

Easy
1min

Given that $\cos\theta=\frac{1}{2}$cosθ=12​.

Easy
< 1min

Consider the adjacent figure:

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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