Guest

sin20x=? plz ans.this

sin20x=? plz   ans.this

Grade:12

1 Answers

Jitender Singh IIT Delhi
askIITians Faculty 158 Points
9 years ago
Ans:Hello student, please find answer to your question
sin(20x) = 2sin(10x)cos(10x)
sin(20x) = 2(2sin(5x)cos(5x))cos(10x)
sin(20x) = 4sin(5x)cos(5x)(cos^{2}(5x)-sin^{2}(5x))
sin(20x) = 4sin(5x)cos(5x)(cos(5x)+sin(5x))(cos(5x)-sin(5x))Now, break 5x into 3x & 2x which can be easily convertible into sinx form
sin(2x) = 2sin(x)cos(x)
sin(3x) = 3sin(x)-4sin^{3}(x)

Think You Can Provide A Better Answer ?

ASK QUESTION

Get your questions answered by the expert for free