What is the value of the expression 6² + 3³?

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle