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The number of solution of tanx + secx = 2cosx in [0, 2π] is

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The number of solution of tanx + secx = 2cosx in [0, 2π] is
(a) 2 

(b) 3 

(c) 0 

(d) 1.

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so there are three solution like x = 30°, 150°, 270°

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