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cosec² a - cosec a.cot a + cosec a + cosec a.cot a - cot² a + cot a - cosec a + cot a - 1
cosec² a - cot² a + 2 cot a - 1
(1 + cot² a) - cot² a + 2 cot a - 1
1 + cot² a - cot² a + 2 cot a - 1
2 cot a ........terbukti