The resultant of P and Q is perpendicular to P . What is theangle between P and Q(a) cos ( / )

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The resultant of P and Q is perpendicular to P . What is the
angle between P and Q
(a) cos ( / ) 1 P Q  (b) cos ( / ) 1 P Q 
(c) sin ( / ) 1 P Q  (d) sin ( / )
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how can tan alpha= p sin 0/ p+ qsin0
shouldnt it be tan alpha + p sin 0/ q+pcos 0

PRAMODMKKUMAR
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Sir can u tell when to use that tan formula

vasundharakalbhor
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Hii, sir…Why can’t we take it as a right-angled triangle with “R” as perpendicular to “P”?

Aryan_editK