- Find an identity for cos4theta in terms of costheta?

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If the Big bang theory based on a singularity is the correct theory ,how come no cause of motion is addressed by the theory? At the moment of a sunset, what is that green flash? Relativity help? Evaluate the function at the given value of x. Round your result to three decimal places.
g(x)=9000(2^x)
x=-2.5? γ = 1/√(1 - u²/c²
Pls make U the subject of the formula?