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Homework Statement
Set f(x) = cos^2(x) + sin(x)
Find the numbers x between 0 and 2pi where the tangent line to the graph of f is horizontal.
Homework Equations
pi/6 pi/2 3pi/2 11pi/6 = x
I do not know how though
The Attempt at a Solution
-2sinx + cosx = 0
Equivalent to zero because derivative = slope = 0 because horizontal
Perhaps I have done it wrong lol, but I have no clue what to do from here if I did do it correct,
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