In the equation Cos(wt+-)=sin(wt) How (-)= -/2

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If vectors A^-->= cos wt i^{^} + sin wt j^{^} and B^-->= cos wt /2^{^}i + sin wt/2 j^{^}are functions of time, then value of t at which they are orthogonal to each other is:

Q. If vectors

\to A = cos w t^i + sin w t^j

and

\to B = cos w t / 2^i + sin w t / 2^j

are functions of time , then the value of

t

at which they are orthogonal to each other is

s i n w t = \frac{1}{\sqrt{2}}

, Find the value of t ?

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