exam Maths Puzzle Numerical Ability

I am trying to work out this problem of Express as a product sin(6t)+ sin(2t).

I am not sure where to begin.

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Diameter of a circle. If the diameter of a circle 1.3 X 10^-12 meters, then what is its radius? Ineed help this the solution (-3,4) this is the problem I need to solve by graphing 5x+7y=6 Can you tellme how to work this problem
m+y=22