exam Maths Puzzle Numerical Ability

Find the exact solutions of the equation: sin2x+2cosxsin2x=0 for x is greater than or = to 0 and less than or = to 2pie.
I know I use a double angle formula for this but I am not

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exam Other Question
Use the properties for radicals to simplify each of the following expressions. Assume that all variables represent positive real numbers.

√12x^3 /5



THis is my radical symbol √ Find values for m and b in the following system so that the solution to the system is (-3, 4)

5x+7y=b

mx+y=22

Thanks for any help you can give

Heather