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Given \frac{1-\cos 2 \theta}{\sin 2 \theta}=\tan \theta Prove the identity Hence, determine the value of tan 22,5, without using a calculator \tan 2 x+\frac{1}{\cos 2 x}=\frac{\sin x+\cos x}{\cos x-\sin x} Prove the identity 4 Without the use of a calculator find the value of sin 40 given that cos 40 = t

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