A projectile is fired making an angle 2 ...

A projectile is fired making an angle `2 theta` with the horizontal with velocity "4m/s" . At the instant it makes an angle `theta` with the horizontal,its velocity is 1) `4cos theta` 2) `4(2cos theta-sec theta)` 3) `2(sec theta+cos theta)` 4) `4(sec theta+cos theta)`

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