Solve the 3 Question and please prove it true or false. Q.3. $\sqrt{\left(1-{\mathrm{cos}}^{2}\theta \right)se{c}^{2}\theta }=\mathrm{tan}\theta$

We have : , TakeL.H.S. :

So, L.H.S. = R.H.S.

Therefore,

Given equation is true .