Trigonometric Identities help, pre-calculus

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Mathematics

Description

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

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Explanation & Answer

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



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