Answers

2014-09-12T18:42:36+05:30
Cosec²x - cot²x = 1
cosec²x = 1 + cot²x
1/sin²x = 1 + cot²x
= > sin²x = 1/1+cot²x
Therefore , 
                 sinx = √1/1+cot²x
1 1 1
sinX=cos(90-X)
sinA=cos(90-A),cos(90-A)=1/cot(90-A), so sinA=1/cot(90-A)
2014-09-12T19:19:13+05:30
1/sin²A=cosec²
cosec²A - cot²A = 1
(putting the value of cosec²A)
1/sin²A - cot²A = 1
1/sin²A = 1 + cot²A
sin²A = 1/1 + cot²A
sinA = √1/1 +  cot²A
1 5 1