exam Maths Puzzle Numerical Ability

Express as a product sin(6t) + sin(2t).

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exam Other Question

The volume of a right circular cone is given by v=1/3*3.14*r2(radius squared)*h
solve for h Problem is:

x - x^2/3 = x^1/3 (??) Fill in the ??. The object is to find the equation that when multiplied by x^1/3 would give the result of x - x^2/3.

I know this has to be something simple, but my brain is fried.