Given , where ,…

MATHEMATICS · Single correct · A Level · Mathematics · Exponentials and logarithms · Exponentials and logarithms

Problem

Given f(x)=ax+a−x2f(x)=\frac{a^x+a^{-x}}{2}, where a>2a>2, then f(x+y)+f(x−y)=f(x+y)+f(x-y)= (1) 2f(x)f(y)2f(x)f(y) (2) f(x)f(y)f(x)f(y) (3) f(x)f(y)\frac{f(x)}{f(y)} (4) None of these

Related theory

Browse the problem library