The list of questions on double angle identities in trigonometry for your practice, and worksheet on double angle trigonometric identities, to know how to use them as formulas in trigonometry problems. The double angle identities examples with solutions to learn how to expand the trigonometric functions having double angles and also learn how to simplify the expressions as the trigonometric functions with double angles.

Evaluate $\dfrac{1}{\sin{10^\circ}}-\dfrac{\sqrt{3}}{\cos{10^\circ}}$

Evaluate $\dfrac{-\sin{x}+\sin{2x}}{1-\cos{x}+\cos{2x}}$

Evaluate $\dfrac{\cos{x}+\sin{x}}{\cos{x}-\sin{x}}$ $-$ $\dfrac{\cos{x}-\sin{x}}{\cos{x}+\sin{x}}$

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