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Double angle identities Trigonometry Problems and Solutions

The list of trigonometry questions on double angle identities for practice with solutions to learn how to use the double angle trigonometric rules as formulas in mathematical problems.

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

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

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