Question

Question #ac0ca

Answer 1

`1+cosa=9/5`

`1+cosa=1/5`

Explanation:

.

`1-sina=2/5`

`sina=1-2/5=3/5`

`sin^2a=9/25`

`sin^2a+cos^2a=1`

`cos^2a=1-sin^2a=1-9/25=16/25`

`cosa=+-4/5`

`1+cosa=1+4/5=9/5`

`1+cosa=1-4/5=1/5`