exam Maths Puzzle Numerical Ability

Express the follolwing in terms of x {x>0}
sin{cos^-1{x/2}}

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exam Other Question

5[2-(2x-4)]=2(5-3x) Hi, Could someone please show me solve this type of problem?
Log(120)= -100/12*(1/20 - 1/x) I need to find x
Thank you