AQA C4 Trig identities. June '10 Q5 b) i)
Help needed with the following (the mark scheme is useless):
Express 3cos2x + 2sin2x in the form Rcos(2x-a), where R>0 and 0<a<90, giving your answer to the nearest 0.1.
R should equal sqrt13 and a should be 33.7. Help would be much appreciated.
Thanks.
Express 3cos2x + 2sin2x in the form Rcos(2x-a), where R>0 and 0<a<90, giving your answer to the nearest 0.1.
R should equal sqrt13 and a should be 33.7. Help would be much appreciated.
Thanks.
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