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Abdellah Elayou

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  • Foydalanuvchi Abdellah Elayou maqolani yaratdi

    having a problem in trigonometry

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    how can I determine the sign of a  trigonometric function? not the regular ones like sin(x) or cos(x) but the advanced like cos(3x+pi/4) and sinx-cosx etc and please if there is a tutorial that can...

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