why sin(-x)=-sinx and cos(-x)=cosx
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because there is no sign in in angles
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sin(Ф)=opposite side/hypotenuse cos(Ф)= adjacent side/hypotenuse
=+y/l =+x/l
sin(-Ф)=-y/l cos(-Ф)=+x/l
x,y,l⇒ are angles
Ф ⇒ is angle
=+y/l =+x/l
sin(-Ф)=-y/l cos(-Ф)=+x/l
x,y,l⇒ are angles
Ф ⇒ is angle
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