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Question Number 128388 by enter last updated on 06/Jan/21

$$y=-sin(\frac{\mathrm{\Pi }}{2}+2x)+2cos(5x+\mathrm{\Pi })$$$$y_{min}=??$$

Commented by TheSupreme last updated on 07/Jan/21

$$y=-cos\left(2x\right)-2cos\left(5x\right)⩾-3$$$$y=-3x=10k\pi$$$$$$$$$$

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