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Here what we want is sin(cosx) >0
Value of cosx(let m=cosx) oscillates from -1 to 1
I.e. -1 ≤m≤1
sinm ≥ 0 for 0 ≤m≤ π/2 or 0≤m≤ 1….(1)
sinm
For sin(cosx) >0 we select 1st option
I.e 0≤ cosx≤1
x € [(2 n+1)π/2, (2 n+3)π/2] where n € odd integer.
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