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[" (2) "2(x)/(cos(x)/(2))=(1)/(sqrt(10))...

[" (2) "2(x)/(cos(x)/(2))=(1)/(sqrt(10))times((1)/(1))=-3],[" 29fites "(1)/(8)" iffett: "cos^(2)x+cos^(2)(x+(pi)/(3))+cos^(2)(x-(pi)/(3))]

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Prove that cos^(2)x+cos^(2)(x+(pi)/(3))+cos^(2)(x-(pi)/(3))=(3)/(2)

Prove that cos^(2)x+cos^(2)(x+(pi)/(3))+cos^(2)(x-(pi)/(3))=(3)/(2)

Prove that : cos^(2)x+cos^(2)(x+(pi)/(3))+cos^(2)(x-(pi)/(3))=(3)/(2)

Prove that, cos^(2)x+cos^(2)(x+(pi)/(3))+cos^(2)(x-(pi)/(3))=(3)/(2) .

Show that cos ^(2) x+cos ^(2)(x+(pi)/(3))+cos ^(2) (x-(pi)/(3))=(3)/(2)

Prove that cos^(2)x + cos^(2)(x + (pi)/(3)) + cos^(2) (x - (pi)/(3)) = (3)/(2)

Prove that cos^2x+cos^2(x+pi/3)+cos^2(x-pi/3)=3/2 .

Prove that cos ^(2) x + cos ^(2) (x + (pi)/(3)) + cos ^(2) (x - (pi)/(3)) = 3/2.

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