L ABC = 1/2×AC×AB×sinA
130cm² = 1/2(25cm)(12cm)sinA
130cm² = 25cm(6cm)sinA
130cm² = 150cm²sinA
sinA = 130cm²/150cm²
sinA = 13/15
cosecA = 1/sinA
= 15/13
cotan²A+1 = cosec²A
(1/tanA)² = (15/13)²-1
1/tan²A = 225/169-169/169
1/tan²A = 56/169
tan²A = 169/56
tanA = √169/56
tanA = 13/√56
tanA = 13√56/56
tanA = 13×2×√14/56
tanA = 13√14/28
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L ABC = 1/2×AC×AB×sinA
130cm² = 1/2(25cm)(12cm)sinA
130cm² = 25cm(6cm)sinA
130cm² = 150cm²sinA
sinA = 130cm²/150cm²
sinA = 13/15
cosecA = 1/sinA
= 15/13
cotan²A+1 = cosec²A
(1/tanA)² = (15/13)²-1
1/tan²A = 225/169-169/169
1/tan²A = 56/169
tan²A = 169/56
tanA = √169/56
tanA = 13/√56
tanA = 13√56/56
tanA = 13×2×√14/56
tanA = 13√14/28