cos^2 40- cos^ 2 50=?
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Answer is =Cos(80).....
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cos^2 40-cos^2 50
=cos^2 40-cos^2(90-40)
=cos^40-sin^2 40
=cos2*40
=cos80
i hope u understand
=cos^2 40-cos^2(90-40)
=cos^40-sin^2 40
=cos2*40
=cos80
i hope u understand
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