Question

resolva: sen[(5π/2)-x]+cos[(9π/2)-x]-sen[(π/2)+x]​

Answer 1

Vamos là.

por parte:

sen[(5π/2)-x] = cos(x)

cos[(9π/2)-x] = sen(x)

sen[(π/2)+x]​ = cos(x)

cos(x) + sen(x) - cos(x) = sen(x)