Question

The straight line with equation3/4x makes an acute angle theta with the x-axis. Find the value of sin2theta and cos2theta. how do i do this?

Answer 1

Have you learned basic trig functions?

Answer 2

\[\tan \theta = \frac{ y }{ x } = \frac{ 3/4 }{ 1 }\]

Answer 3

\[\theta = \tan^{-1} \left( \frac{ 3 }{ 4 } \right)\]

Answer 4

Does this help, or do you need to solve it not using trig functions?

Answer 5

thanks (:. this helped a lot. i think i understand now