1. Turning points with Trigonometry

Hey there. I've been doing turning points using quadratic equations and differentiation, but when it comes to using trigonomic deriviatives and the location of turning points I can't seem to find anything use In my text books.

If y = sin2x

If y = sin3x

"Using differentiation, what is the value of the gradient and what are the value of x for the first turning points?"

Obviously the deriviative is 2cos2x, 3cos3x, but locating the turning points from here is giving me a little trouble . Any help is greatly appreciated as I think this may be on my exam.

(SORRY, i think this was posted in the wrong forum)

2. Originally Posted by thecakeisalie
Hey there. I've been doing turning points using quadratic equations and differentiation, but when it comes to using trigonomic deriviatives and the location of turning points I can't seem to find anything use In my text books.

If y = sin2x

If y = sin3x

"Using differentiation, what is the value of the gradient and what are the value of x for the first turning points?"

Obviously the deriviative is 2cos2x, 3cos3x, but locating the turning points from here is giving me a little trouble . Any help is greatly appreciated as I think this may be on my exam.

(SORRY, i think this was posted in the wrong forum)
When the function reaches a turning point then the function is at a relative max/min. What happens to the slope of the line tangent to the function at these points?

-Dan

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how to find the turning point of a trig function

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