(2x-3)(2x+3) can be multiplied out using the FOIL method, which stands for: First Outer Inner Last This method only works for the multiplication of two binomials, so don't rely exclusively upon it....
I presume that sin-1x is being used to represent the inverse sin function (I prefer arcsin x to avoid possible confusion). Make use of the trignometirc relationships: cos2θ + sin2θ = 1 ⇒ cosθ =...
Yes you can. It looks like this: (()This is called "nesting" parentheses. It is applicable to both language e.g. John saw the boy (who was standing on the bridge (Wikfield's Bridge)) take the money....