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2014-06-04T20:43:43+07:00
cosec A+cotan A
= 1/sinA + cos A/ sinA
= (1 + cos A)/sinA
= (1 + cosA)(1 - cosA) / sinA(1 - cosA)
= (1 - cos²A) /
sinA(1 - cosA)
= sin²A / sinA(1 - cosA)
= sinA / 1-cosA          TERBUKTI
2014-06-04T20:44:45+07:00
Csc A + cotA = sinA/ 1- cos A
1/sin a + cosA/sinA = sinA/1-cosA
1 + cosA
---------- = sinA/1-cosA
sinA