The derivative of the function y = 12 (ex + e − x) is () A. 12(ex−e−x)B. 12(ex+e−x)C. ex-e-xD. ex+e-x

The derivative of the function y = 12 (ex + e − x) is () A. 12(ex−e−x)B. 12(ex+e−x)C. ex-e-xD. ex+e-x

∵ y = 12 (ex + e − x), ∵ y ′ = 12 (ex − 1 × e − x) = 12 (ex − e − x)