(xxi) If 2y cos  θ  = xsin  θ and 2x sec  θ - y cosec  θ = 3, then what is the value of x2 + 4y ?
(a) 2                (b) 1                 (c) 0                   (d) None of these.
(xxii) If tan  θ + cot  θ = 2, then the value of tan  θ - cot  θ is
(a) 1                (b) 2                 (c) - 1                 (d) None of these.
(xxiii) If 3 cos  θ - 4 sin  θ = 5, then the value of 3 sin  θ + 4 cos  θ is
(a) 1                (b)  2                (c) 0                    (d) None of these.

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