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If a number is to the power of 2/3, you should think of it as to the power of 1/3 (so CUBE-rooted), and then being to the power of 2 (so squared).

So here, the cube root of 64 is 4, because 4x4x4=6...

The easy way to remember these uses the acronym SOH-CAH-TOA

The function to use depends on the sides of the triangle you know in the problem. 

With right angled triangles each side has a nam...

Put w=a+bi, z=c+di where a, b, c, d are real, and i²=-1. Then |wz|²=|(a+bi)(c+di)|²=|ac-bd+(ad+cb)i|²=(ac)²+(bd)²-2bcd+(ad)²+(c...