Actually i am just double checking my answer to see if i am doing it right. so anyone kindly help me out on these question. i just need the answer but working is prefered if you care to type it out

1. Find the angles of the triangle whose sides are of length 2, 4 and 5cm.

2.solve the triangle ABC in which A = 31degree , B = 14degree, and c = 7cm.

3.In triangle ABC , a = 4 , b = 6 , c = 9. Solve the triangle to find the missing elements.

4.In triangle ABC, B=122degree, C = 15degree, c= 2.5cm. Solve the triangle.

Simplify:

1)2sin^sqtx +cos2x

2)2sin2 0 cos2 0

3)(1-cos2A)/(sin2A)

2. Given sin x = -3/5 & cos y =-5/13;both X&Y are in 3rd quardrant. Find,without evaluating the angel.

a) sin(x+y)

b)cos(x-y)

c)tan(x+y)

solve the equation for all nonzero value of x for 0degree >x>360

3cos2x+sinx-2=0

Big thanks to you