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try sum and difference identities?
Maybe, but I'm not supposed to know that for this course. Any other ideas?
what course is that?
Extension 1 Maths - Nsw Aus
subtract sin 4x from both sides and graph it
Graph it? Nah that would be cheating
graph it and sum/difference identities are the only ways I can think of to solve it
I'll give sum/difference a try
Yah on the left side we can see the `Angle Sum Identity for Sine` expanded out.
So if we work it backwards, we might be able to get where we need to go.
We currently have something like this:
\(\large \sin a\cos b+\sin b\cos a\) which will simplify down to \(\large \sin(a+b)\)
Of course! Thanks
Yeah that's done it
yep, that's a sum identity as I said before. Thank you zepdrix