Verify the identity. $\frac { \sin \theta + \sin 9 \theta } { \cos \theta + \cos 9 \theta } = \tan 9 \theta$
A) Not identical
B) Identical

Name: Verify the identity. $\frac { \sin \theta + \sin 9 \theta } { \cos \theta + \cos 9 \theta } = \tan 9 \theta$ A) Not identical B) Identical
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Question

Quizplus · Accepted Answer

The identity is not correct. Simplifying the left side using sum-to-product identities does not result in $\tan 9\theta$.

Verify the Identity sin⁡θ+sin⁡9θcos⁡θ+cos⁡9θ=tan⁡9θ\frac { \sin \theta + \sin 9 \theta } { \cos \theta + \cos 9 \theta } = \tan 9 \thetacosθ+cos9θsinθ+sin9θ​=tan9θ

Verify the Identity $\frac { \sin \theta + \sin 9 \theta } { \cos \theta + \cos 9 \theta } = \tan 9 \theta$