Ex. 4C Q2. Find the equation of the tangent to the curve y=2^x + 2^(-x) at the point (2, 4.25)
I know you have to differentiate this, but what do you do after that?
The question relies on your know the derivative of ax - you can derive the result by writing ax=(elna)x=exlna then using the derivative of ekx which you should know. Find the gradient and then apply the standard equation of a line y−y1=m(x−x1)