Derivatives of Trig Functions: Applications

Derivatives of Trig Functions: Applications

2. For the equation y = 3 cosx, find the minimum and maximum points.

    Take the derivative, set it equal to zero, and solve.

    dy/dx = -3 sinx = 0

        x = 0.pi, 2pi, 3pi, etc.

Maximum points: 0, 2pi, 4pi, etc

Minimum points: pi, 3pi, 5pi, etc

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