exam Maths Puzzle Numerical Ability

Use the addition and subtraction formulas to simplify cos(x-3pi/2).

I came up with cosx for my answer. Is this correct?

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exam Other Question
f(x)=7x+2 find f(x) when x=0 and when x=1 How would you solve this equation?

z=8*square root of z +240

Any help is appreciated thanks alot!