Question

How to use fundamental identities to simplify 9sinβtanβ+9cosβ ?

Answer 1

`9sinβtanβ+9cosβ`

`=(9sinβ sinbeta)/cosbetaβ+9cosβ`
`=(9(sin^2beta+cos^2beta))/cosβ`

`=9/cosβ=9secbeta`