1.

The length of the chord of the parabola \[{{y}^{2}}=4ax\] which passes through the vertex and makes an angle \[\theta \] with the axis of the parabola, is

A.            \[4a\cos \theta \,\text{cose}{{\text{c}}^{2}}\,\theta \]             
B.            \[4a{{\cos }^{2}}\theta \,\text{cosec}\,\theta \]
C.            \[a\cos \theta \,\text{cose}{{\text{c}}^{2}}\,\theta \]
D.            \[a{{\cos }^{2}}\theta \,\text{cosec}\,\theta \]
Answer» B.            \[4a{{\cos }^{2}}\theta \,\text{cosec}\,\theta \]


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