यदि `sec(4x-50^(@))="co s ec"(50^(@)-x),` तो `x` का मान क्या है ?

Options

A. `45^(@)`
B. `90^(@)`
C. `30^(@)`
D. `60^(@)`

Answer

c

Explanation

`sec(4x-50^(@))=co s ec(50^(@)-x)`
`sec(4x-50^(@))=co s ec(90^(@)-x)`
`sec(4x-50^(@))=s ec140^(@)+x`
`4x-50^(@)=40^(@)+x`
`3x=90^(@)`
`x=30^(@)`