Prove : Tan20+4Tan20=√3

prove that :tan20 tan30 tan40 =tan10

how to prove that (a^2-b^2)^3+(b^2-c^2)^3+(c^2-a^2)^3=3 (a^2-b^2)(b^2-c^2)(c^2-a^2) please help

If A + B + C = 180° prove that Sin2A + sin2B – sin2C = 4cosAcosBsinC

If A + B + C = 180° prove that cos2A + cos2B – cos2C = -1 -4cosAcosBcosC

If A + B + C = 180°, Prove that Cos²A + Cos²B - Cos²C = 1 – 2sinAsinBcosC

Tan20+4sin20=√3

Prove :Tan20+4sin20=square root 3

Prove L=L

Prove that (a^2+b^2)x^2 + 2 = 0 has no real roots if a is not equal to b

how do you prove something to be true

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