book Maths Puzzle Numerical Ability

Find the Amplitude of Y = -8 sin 4 X

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book Other Question

In an endurance race, Alyson rode her bike 7 miles less than Jeff. Together they rode 39 miles. How far did Jeff Ride? Solve each equation for all values of theta. the problem is sin(theta/2)
plus cosine(theta/2)= sqrt(2)