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CanadaON
Grade 11

Tangent Identity (proofs and equivalences)

Interactive practice questions

By finding the ratio represented by $\sin\theta$sinθ, $\cos\theta$cosθ and $\tan\theta$tanθ in the given figure, we want to prove that $\frac{\sin\theta}{\cos\theta}=\tan\theta$sinθcosθ=tanθ.

a

Write down the expression for $\sin\theta$sinθ.

b

Write down the expression for $\cos\theta$cosθ.

c

Hence, form an expression for $\frac{\sin\theta}{\cos\theta}$sinθcosθ.

d

Write down the expression for $\tan\theta$tanθ.

e

Does $\frac{\sin\theta}{\cos\theta}=\tan\theta$sinθcosθ=tanθ?

Yes

A

No

B
Easy
2min

Which of the following options correctly completes the identity?

$\tan z=\editable{}$tanz=

Easy
< 1min

Given that $\sin x=\frac{4}{5}$sinx=45 and $\cos x=\frac{3}{5}$cosx=35, find $\tan x$tanx.

Easy
< 1min

Use properties of the trigonometric functions to find the exact value of $\tan10^\circ-\frac{\sin10^\circ}{\cos10^\circ}$tan10°sin10°cos10°

Easy
< 1min
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Outcomes

11U.D.1.5

Prove simple trigonometric identities, using the Pythagorean identity sin^2(x) + cos^2(x) = 1; the quotient identity tanx=sinx/cosx; and the reciprocal identities secx=1/cosx, cscx=1/sinx, cotx=1/tanx

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