Question

Question #9aca1

Answer 1

`tanA=-3/4`

Explanation:

`•color(white)(x)cosA=+-sqrt(1-sin^2A)`

`"since "90 < A <180`

`"then "cosA" and "tanA<0`

`cosA=-sqrt(1-9/25)=-sqrt(16/25)=-4/5`

`•color(white)(x)tanA=sinA/cosA=(3/5)/(-4/5)=-3/4`