Marnett305 Marnett305

12-07-2015
Mathematics

Answered

Find all solutions to the equation. 7 sin2x - 14 sin x + 2 = -5

Verified Answer :

13-07-2015

7sin²x-14sinx+2= -5
7sin²x-14sinx+7=0
7(sin²x-2sinx+1)=0
sin²x-2sinx+1=0
(sinx-1)(sinx-1)=0
sinx-1=0
sinx=1
\(x= \frac{ \pi }{2} +2n \pi\) where n is an integer

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