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Question Number 157494 by MathSh last updated on 23/Oct/21

Answered by MJS_new last updated on 24/Oct/21

$$\mathrm{let}s=\sin x$$$$\sqrt{-9s^2+12s+13}=-\frac{4s^2-32s-13}{8}$$$$s^4-16s^3+\frac{187}{2}{s}^2+4s-\frac{663}{16}=0$$$$\mathrm{no}‘‘{\mathrm{nice}}^{″}\mathrm{solution}$$$$s\approx -.649720963256\vee s\approx .682719298518$$

Commented by MathSh last updated on 24/Oct/21

$$\mathrm{Thank}\mathrm{you}\mathrm{dear}\mathbf{S}\mathrm{er}\mathrm{cool}$$

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