u can ask this question from kopal,fantas,paras etc. every body will help u.

because there is no sign in in angles

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u can ask this question from kopal,fantas,paras etc. every body will help u.

because there is no sign in in angles

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=+y/l =+x/l

sin(-Ф)=-y/l cos(-Ф)=+x/l

x,y,l⇒ are angles

Ф ⇒ is angle