Question Number 207562 by hardmath last updated on 18/May/24
$$\mathrm{4}\:\mathrm{cos}\:\mathrm{50}°\:−\:\frac{\mathrm{1}}{\mathrm{sin}\:\mathrm{20}°}\:\:=\:\:? \\ $$
Commented by Frix last updated on 18/May/24
$$−\mathrm{2tan}\:\mathrm{10}° \\ $$