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Verify the identity cos(2x)/sin(2x)+2sin^2(x)=1/2(cot(x)-1). Need help? Is it helpful in acidity ? Complex Eigenvalues problem help!!!!!!!!!!!!!!!!? Why does the volume of water changes after cooling and heating, compare to Cyclohexane the volume remains the same? Which elements is the most abundant rock-forming element of the Earth's crust?