Trigonometric Identities help, pre-calculus

label Calculus
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solve 7cos^2(x)-2sinx+2=0

May 26th, 2015

7cos^2(x)-2sin(x)+2=0

cos^2(x)=(1+cos2x)/2

7(1+cos2x)/2-2sinx+2=0

multiply with 4 both sides

7(1+cos2x)-4sinx+4=0


May 26th, 2015

7(1+cos2x)-4sinx+4=0

7(1+cos2x)-4(sinx+1)=0

7(1+  1 – 2 sin2 x)-4(sinx+1)=

7(2-2 sin2 x)-4(sinx+1)=0

14(1-sin2 x)-4(sinx+1)=0

14cos^2(x)-4(sinx+1)=0

..........................................................check now

May 26th, 2015

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