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C3 - Addition and Double angle formulae

Can anybody help me simplify (3sinx-4sin^3x)/(3sin3x) please?? :tongue:
Original post by stanners 27
Can anybody help me simplify (3sinx-4sin^3x)/(3sin3x) please?? :tongue:

What have you tried?

Write sin(3x) as sin(2x + x) and use the rule for
sin(A+B) = sin(A)cos(D)+cos(A)sin(B)
And then you'll have to use the rule again, see where this take you.
Reply 2
Avatar for akash11
akash11
9
It got the final anwser of 1
Reply 3
Avatar for stanners 27
stanners 27
OP
2
Original post by TheIrrational
What have you tried?

Write sin(3x) as sin(2x + x) and use the rule for
sin(A+B) = sin(A)cos(D)+cos(A)sin(B)
And then you'll have to use the rule again, see where this take you.

Thank you, I have tried this and think I have a suitable answere :biggrin:
Reply 4
Avatar for stanners 27
stanners 27
OP
2
Original post by akash11
It got the final anwser of 1


Really? I got the final answer as 1/3
Original post by stanners 27
Really? I got the final answer as 1/3


You're right, it is 13\frac{1}{3}

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