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Important Questions
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alpha cos\alpha$ --- // BISE Sargodha(2015), BISE Lahore(2017)// * Prove that (without calculator) $sin\... ac{1}{\sqrt{2}}(sin\alpha+cos\alpha)$ --- // BISE Lahore(2017)// * Prove that $\frac{sin\theta+sin3\thet... eta+cos5\theta+cos7\theta}=tan4\theta$--- // BISE Lahore(2017)// * Prove that $\frac{cos8^{\circ}-sin8^{