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Under the optimization design of senior one mathematics, I basically passed 42 pages, the first question 10.
Didn't your teacher give you an answer?

F(x)= radical 2sin(x+π/4)= radical 2cos(x-π/4)

When X=0 f(-0)=0

f(-x)= sin(-x)+cos(-x)=-sinx+cosx

And f(-x)=-f(x), so f(x)=sinx-cosx.

f(x)= sinx+cosx x & gt; 0

=0 x=0

sinx-cosx x & lt; 0