1-cos-4-7-1-cos-4-2-7-1-cos-4-3-7-

Question Number 150482 by mathdanisur last updated on 12/Aug/21

$$\frac{\mathrm{1}}{\mathrm{cos}^{\mathrm{4}} \:\frac{\boldsymbol{\pi}}{\mathrm{7}}}\:\:+\:\:\frac{\mathrm{1}}{\mathrm{cos}^{\mathrm{4}} \:\frac{\mathrm{2}\boldsymbol{\pi}}{\mathrm{7}}}\:\:+\:\:\frac{\mathrm{1}}{\mathrm{cos}^{\mathrm{4}} \:\frac{\mathrm{3}\boldsymbol{\pi}}{\mathrm{7}}}\:\:=\:\:? \\ $$

Commented by liberty last updated on 13/Aug/21

$$=\mathrm{374} \\ $$

Commented by mathdanisur last updated on 13/Aug/21

$$\mathrm{Thanks}\:\mathrm{Ser},\:\mathrm{how}.? \\ $$

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