- What is to rewrite cos^4(x) in the first power?

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Which of the following is the contrapositive of a statement " if i can afford the airfare, then i will purchase a nonstop flight"? Find the length of the unknown side of the triangle. The the exact length and approximate length.? Cos^2 x + 2 cos x+1= 0 Solve the equation on the interval [0, 2pi).? -8 = z + 3z? How can I make one switch turn on two different electronic circuits simultaneously?