Видео ютуба по тегу Prove That: 8 * Cos20° * Cos40° * Cos80° = 1

Find the value of the expression cos ^4π/8+cos ^43 π/8+cos ^45 π/8+cos ^47 π/8 [Hint: Simplify th...
Find the value of the expression cos ^4π/8+cos ^43 π/8+cos ^45 π/8+cos ^47 π/8 [Hint: Simplify th...
Prove that sin 40^∘cos 20^∘+cos 40^∘sin 20^∘=√(3)/2
Prove that sin 40^∘cos 20^∘+cos 40^∘sin 20^∘=√(3)/2
Prove that: (1+cosπ/8)(1+cos3 π/8)(1+cos5 π/8)(1+cos7 π/8)=1/8
Prove that: (1+cosπ/8)(1+cos3 π/8)(1+cos5 π/8)(1+cos7 π/8)=1/8
cos 20^∘+8 sin 70^∘sin 50^∘sin 10^∘/sin ^2 80^∘ is equal to:(A) 1 (B) 2 (C) 3 / 4
cos 20^∘+8 sin 70^∘sin 50^∘sin 10^∘/sin ^2 80^∘ is equal to:(A) 1 (B) 2 (C) 3 / 4
Докажите следующее: sin 20^∘sin 40^∘sin 60^∘sin 80^∘=3/16
Докажите следующее: sin 20^∘sin 40^∘sin 60^∘sin 80^∘=3/16