Answers

2014-10-02T21:40:40+05:30

SIN2A=2 SIN A .COS A

COS 2A =COS²A-SIN²A  (OR) 1-2SIN²A (OR) 2COS²A-1

TAN2A=(2 TAN A)/1-TAN²A)

COT 2A=(COT²A-I)/2 COT A


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buddy...do u knw...other equations of sin2A??
2014-10-03T19:43:34+05:30

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Sin\ 2 A = 2\ Sin A\ Cos A = \frac{2\ tan\ A}{1+tan^2A} \\ \\Cos\ 2A = 2\ Cos^2A-1= 1 - 2\ Sin^2A = Cos^2A-Sin^2A=\frac{1-tan^2A}{1+tan^2A}\\ \\tan\ 2A = \frac{2\ tan\ A}{1-tan^2A}=\frac{sin\ 2A}{cos\ 2A}\\ \\Sin\ 3A=3\ Sin\ A-4\ Sin^3A\\ \\Cos\ 3A=4\ Cos^3A-3\ Cos\ A\\ \\tan\ 3A=\frac{3\ tan\ A-tan^3A}{1-3\ tan^2A} \\
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