Provethat sin A-2 sin 3 A - 2 cos 3 A-cosA -tanA

LHS =sinA 2sin^3A2cos^3A cosA =sinA(1 2sin^2A)cosA(2cos^2A 1) =tanA[1+2(1 cos^2A)]2cos^2A 1 =tanA = RHS ...

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Expansion of (a ± b ± c)²

provethat sin...

Question

$p r o v e t h a t \frac{s i n A - 2 {s i n}^{3} A}{2 {c o s}^{3} A - c o s A} = t a n A$

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\frac{s i n A - 2 s i n^{3} A}{2 c o s^{3} A - c o s A} = t a n A

\frac{sin A - 2 {sin}^{3} A}{2 {cos}^{3} A - cos A} = tan A

$\frac{s i n A - 2 s i n^{3} A}{2 c o s^{3} A - c o s A}$

$\frac{sin A - 2 {sin}^{3} A}{2 {cos}^{3} A - cos A} =$

\frac{1 + s i n A}{1 - s i n A} = s e c A - t a n A

\frac{s i n A - 2 s i n^{2} A}{2 c o s^{3} A - c o s A} = t a n A

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