Question

sin a5/13 sin b 13/5 sin a-b ?
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Answer 1

sinA=4/5 , cotA= 3/4

sinB=5/13 , cotB=12/5

cot(A-B)=( cotA.cotB + 1)/(cotB - cotA)

=( 3/4×12/5 + 1)/(12/5 - 3/4)

=(9/5 + 1)/(48-15/20)

=(9+5)5/(33/20)

=14×4/33

=56/33

Answer 2

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