in the triangle ABC, AC=3, BC=2, angleBAC=theta and angleABC=2theta

calculate the value of theta to the nearest tenth of a degree.

i think i'm complicating this thing for myself because i cant get farther than 2 x sin2theta = 3 x sintheta (Punch)

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- May 19th 2009, 11:10 PMthe kopitefind the angle with the greek letter
in the triangle ABC, AC=3, BC=2, angleBAC=theta and angleABC=2theta

calculate the value of theta to the nearest tenth of a degree.

i think i'm complicating this thing for myself because i cant get farther than 2 x sin2theta = 3 x sintheta (Punch) - May 19th 2009, 11:25 PMGrandad
- May 19th 2009, 11:31 PMthe kopite
thanks a lot, but im here to understand. why does 2sin2theta equal 4sintheta x costheta in the first line of your reasoning?

- May 19th 2009, 11:40 PMdarthfader
I think its the 'Double Angle Identity' in Trigonometry.

Note that

I hope this helps. (Rofl)