Hint: use the identity
And note that
is a constant.
I'm having trouble with this question. Normally i would use auxiliary method but I'm having difficulty. Thanks in advance.
(i) Express 2cosθ + 2cos(θ + π∕3) in the form Rcos (θ + α), where R > 0 and, 0 < α < π/2
(ii) Hence, or otherwise, solve 2cosθ + 2cos(θ + π∕3) = 3, for 0 < α < 2π
Hint: use the identity
And note that
is a constant.
Last edited by fan96; 31 Mar 2018 at 8:46 PM.
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Thanks!
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