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Question Number 137103 by Boucatchou last updated on 29/Mar/21

$$Solve3cos5x-4sin4x-3=0in\mathbb{R}$$

Answered by MJS_new last updated on 30/Mar/21

$$\mathrm{obviously}x=2n\pi \mathrm{is}\mathrm{a}\mathrm{solution}$$$$\mathrm{the}\mathrm{others}\mathrm{can}\mathrm{only}\mathrm{be}\mathrm{approximated}$$$$x\approx .966119+2n\pi$$$$x\approx 1.47065+2n\pi$$$$x\approx 2.39052+2n\pi$$$$x\approx 2.86574+2n\pi$$$$x\approx 5.90132+2n\pi$$$$\mathrm{with}n\in \mathbb{Z}$$

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