NDA Government Jobs Exams

If cosecθ + cotθ = c, then what is cos θ equal to ?

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NDA Other Question

The angle of elevation of the top of a tower of height H from the foot of another tower in the same plane is
60º and the angle of elevation of the top of the second tower from the foot of the first tower is 30º. If h is the
height of the other tower,then find relation between h and H If sinθ + 2 cosθ = 1, then what is 2 sinθ – cosθ equal to