Question

cos(x)-sin(x)=sqrt(2)sin(x)
prove that: cos(x)+sin(x)=sqrt(2)cos(x)

Answer 1

1.f(x)= log(\[\sqrt{x ^{2}+1}\]-x)
2.f(x)= xlog(
x+\[\sqrt{x ^{2}+1}\]
)
find which is odd and which is even