- #1
DMac
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[SOLVED] Derivatives of Trigonometric Functions
I need to find the critical numbers of this function:
y = cos x - sin x where -pi <= x <= pi
I found the derivative as:
dy/dx = -(sin x + cos x)
But when I equate dy/dx to zero, I get:
sin x + cos x = 0...where do I go from here?
I need to find the critical numbers of this function:
y = cos x - sin x where -pi <= x <= pi
I found the derivative as:
dy/dx = -(sin x + cos x)
But when I equate dy/dx to zero, I get:
sin x + cos x = 0...where do I go from here?