(xxi) If 2y cos = xsin and 2x sec - y cosec = 3, then what is the value of x2 + 4y2 ?
(a) 2 (b) 1 (c) 0 (d) None of these.
(xxii) If tan + cot = 2, then the value of tan - cot is
(a) 1 (b) 2 (c) - 1 (d) None of these.
(xxiii) If 3 cos - 4 sin = 5, then the value of 3 sin + 4 cos is
(a) 1 (b) 2 (c) 0 (d) None of these.
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