Question

cosec10+cosec50-cosec70=?​

Answer 1

Answer : 6

Step by step explanation :

cosec10 +  cosec50 - cosec70

» cosec10 + 1/sin50 - 1/sin70

» cosec10 + [sin70 - sin50] / [sin50 sin70]

» cosec 10 + [2 cos60 sin10] / [ sin50 sin70 ]

» 1/ sin10 + sin10 / [sin50 sin70 ]

» [sin50 sin70 + sin^2 10 ] / ( [ cos 20 - cos 120]/2 × Sin10 )

»[ cos20 - cos120 + 1 - cos20 ] / ( [ cos20 - cos120 ] × Sin10)

» [ 3/2 ] / [ sin10 cos20 + 1/2 sin10]

» 3 / [ sin30 - sin10 + sin10 ]

» 3 / [1/2]

» 3 × 2

» 6