2 tan a = 3 tan b, then prove that sin (a + b) = 5 sin (a - b)
2 tan a = 3 tan b, then prove that sin (a + b) = 5 sin (a - b)
pranay kamal , 8 Years ago
Grade 11
Trigonometry> 2 tan a = 3 tan b, then prove that sin (a...
1 Answers
Arun
we can write as
2 sinA cosB= 3sinB cosA (1)
now expand the LHS
sinA cosB + cosA sinB
put the value sinA cos B from (1)
and also solve RHS, then you will see that LHS=RHS
hence proved
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