Question

How to proof ratta fication formulae of trignometry?

Answer 1

To get the maximum and minimum value of sinx + cosx , we see that the expression is of the form a*sinx + b* cosx .Here in given expression it is clear that a = b =1, We can apply Ratta-fication formula to get the maximum and minimum value. a*sinx + b*cosx, maximum & minimum value is (+,-)√[a^2+b^2].