Let S = . The sum of all distinct solutions of the equation sec x + cosec x + 2 (tan x – cot x) = 0 in the set S is equal to
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+ 2(sin2x – cos2x) = 0
for n = 0, ⇒
for n = 1, 2x = 2π ±
+ve – ve 2x = 2π – + x ⇒
for n = – 1, 2x = – 2π ±
+ve 3x = – 2π +
Required sum = = 0.