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Find-4-cos-2-40-1-cos-20-




Question Number 207269 by hardmath last updated on 10/May/24
Find:   4 cos^2  40 − (1/(cos 20)) = ?
$$\mathrm{Find}:\:\:\:\mathrm{4}\:\mathrm{cos}^{\mathrm{2}} \:\mathrm{40}\:−\:\frac{\mathrm{1}}{\mathrm{cos}\:\mathrm{20}}\:=\:? \\ $$

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