- Sec^2 a (1-sin^2 a) - 2tan^2 a?

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Use the Half Angle Formulas to find the exact value of the following. sin(7pi/8)? Standar deviation? Transform the function f(x)=e^x to make such translated four units to the right, vertically compressedby 1/3, and translated 5 units down? Word problem please help? Use the fact that every nonempty interval of real numbers?