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A parrel of land has sides measuring175ft, 234ft, 295ft and 415ft and the angle between the sides of the length 234ft and 295ft has measure 137.1° what is the measure of the opposite this angle?
Which angle between 0° and 360° has the same cosine as the angle 63°?

Enter your answer as an integer
Sin 3a+ sin2a- sin a = 4sin a cos a/2 cos 3a/2
if t = tan(x/2), -π<x<π, show that
cos x = (1-t^2)/(1+t^2) and sin x = (2t)/(1+t^2)
if t = tan(x/2), -π<x<π, sketch aright triangle or use trigonometric identities to show that
cos(x/2) = 1/sqrt(1+t^2) and sin(x/2) = t/sqrt(1+t^2)
Two triangles can be formed with the given information. Use the Law of Sines to solve the triangles.

A = 55°, a = 12, b = 14
A triangle has sides a = 2cm, b = 3cm and ÐC = 60o find the length of side c.
Please help prove that (3sinx+2sin2x)/(1+3cosx+cos2x)=tanx where x is a constant......
sin (2 theta) = cos (3 theta)
In the diagram below, ab and ac are phasors representing the alternating currents in two branches of a circuit. The line ac represents the resultant current. Find the resultant current.
Description of the diagram:
right angled triangle labelled a, b, c
line AB has 15A and line BC has 10A
the angle is 40 degrees
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