Input your trigonometric and see how slope changes

Input your function and see how slope changes
Kindly input the function cos(x). Now check the slope at , 2[math]\pi[/math], and -[math]\pi[/math].
Now solve the equation [math]6cos^2\left(x\right)-cos\left(x\right)-1=0[/math], for [math]o\le x\le2\pi[/math].
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Information: Input your trigonometric and see how slope changes