Question: how do you solve this with work/steps? thank you!! 7. [14 marks] No Calculator (a) Express 2cos2x + sin x in terms of sin x

how do you solve this with work/steps? thank you!!

7. [14 marks] No Calculator (a) Express 2cos2x + sin x in terms of sin x only. (b) Solve the equation 2cos2 x + sin x =2 for x in the interval 0 x S 7 , giving your answers exactly

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