Question

Help Please! For some reason I can't get the second question right =/

Answer 1

is the second derivative
\[-2\sin(x)-\sqrt{2}\]?

Answer 2

then you would need to solve
\[-2\sin(x)-\sqrt2=0\]
\[\sin(x)=-\frac{\sqrt{2}}{2}\]

Answer 3

show us what u got for your 2nd derivative we tell u if its right

Answer 4

you have one solution \(\frac{5\pi}{4}\) as you said
other one is across at \(\frac{7\pi}{4}\)

Answer 5

yeah I'm not allowed a calculator so I'm having difficulties - can you show me your calculations if you can?

Answer 6

and i got -2sin(x)-sqrt(2) for second derivative