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Prove the following identities and state where the identity is undefined:
a. $\dfrac{\cos 2 x+1}{\sin 2 x \cdot \tan x}=\dfrac{1}{\tan ^{2} x}$
b. $\dfrac{1+\cos 2 A}{\cos 2 A}=\dfrac{\tan 2 A}{\tan A}$
c. $\dfrac{\sin x+\sin 2 x}{1+\cos x+\cos 2 x}=\tan x$
in Mathematics by Bronze Status (9,486 points) | 17 views

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