Introducing the parameter t=tanθ2 turns out to be a very useful tool in solving certain types of trigonometric equations and also in finding certain integrals involving trigonometric functions. The basic idea is to relate sinθ, cosθ and even tanθ to the tangent of half the angle.
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Introducing the parameter t=tanθ2 turns out to be a very useful tool in solving certain types of trigonometric equations and also in finding certain integrals involving trigonometric functions. The basic idea is to relate sinθ, cosθ and even tanθ to the tangent of half the angle.
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