math question help (1 Viewer)

[SpiderX1X]

 

[StudyOnly]

Is the answer cosθ ?
If so, just sub tan(θ/2) for t
and you get 1 + (tan(θ/2))^2 at bottom which can be equated using the trig identity to (sec(θ/2))^2
and take it from there

 

[klmtutor]

cos θ not cos 2θ

 

[StudyOnly]

cos θ not cos 2θ

Yes you're right, just rushed the answer and forgot about θ/2.

 

[SpiderX1X]

 

[SpiderX1X]

what about that one , just wondering if i got that right

 

[klmtutor]

Solutions when cos 2θ = 0 or tan (3θ) - 1 = 0 for 0 ≤ θ ≤ 360.

8 solutions (cos: 45, 135, 225, 315 tan:15, 75, 135, 195, 255, 315)