# SOLUTION: How to solve this problem and the steps w/five key points? y = Sin 4x? I'm a beginner can u help?

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 Question 257759: How to solve this problem and the steps w/five key points? y = Sin 4x? I'm a beginner can u help?Answer by drk(1908)   (Show Source): You can put this solution on YOUR website!This you really can't solve. You can simplify or graph. (i) -- Now 4x = 2x + 2x, so we get (ii) we have an identity: sin(A+B) = sinA cosB + sinB cosA or in our case (iii) But these are the same, so we can write (Iv) -- Now 2x = x + x, so we get (v) we have an identity: sin(A+B) = sinA cosB + sinB cosA or in our case (vi) But these are the same, so we can write (vii) From (iv) and (vii), we get