Question

If sin α= 3/5 and 900 <α< 180° then
Cos3α=​

Answer 1

Answer:

`(tan(18 0^(@)-alpha)cos(180^(@)-alpha)tan(90^(@)-alpha))/(sin(9 0^(@)+alpha)cos(9 0^(@)-alpha)tan(9 0^(@)+alpha)`, expression wherever it is defined, is equal to