Which sum or difference identity could be used to prove that sin(pie + q) = -sin q

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?