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cos²α + cos²α.sin²α/cos²α = 1
cos²α + sin²α = 1
1 = 1
(terbukti)
2. sin α + cos α / sin α . cos α = cosec α
sin α + cos²α/sin α = cosec α
(sin²α + cos²α) / sin α = cosec α
1 / sin α = cosec α
cosec α = cosec α
(terbukti)