If cosecA is 13/12, then evaluate 2 sinA - 3 cosA/ 4 sin A - 9 cosA.
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cosecA = 13/12
then sinA =12/13 or cosA = 5/13
then 2sinA-3cosA/4sinA-9cosA
2*12/13-3*5/13/4*12/13-9*5/13
24/13-15/13/48/13-45/13
9/13/3/13
3
then sinA =12/13 or cosA = 5/13
then 2sinA-3cosA/4sinA-9cosA
2*12/13-3*5/13/4*12/13-9*5/13
24/13-15/13/48/13-45/13
9/13/3/13
3
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