My book has horrible explanations and there are only two, i assume for questions such as the second one in my title i would have to simplify the equation, solve it and then find the max/min, but how about for expressions such as sin^2(x)+4, cos^2(x)...etc.
If someone can hint me or teach me a general algebraic rule or such to find max/min's of such equations i would be grateful.
thank you.
If someone can hint me or teach me a general algebraic rule or such to find max/min's of such equations i would be grateful.
thank you.