NEED HELP FASTT
PLEASE HELP TIMED
IMPORTant
Which sum or difference identity would you use to verify that cos (180° - q) = -cos q?
a.
sin (a -b) = sin a cos b – cos a sin b
b.
cos (a -b) = cos a cos b – sin a sin b
c.
cos (a -b) = cos a cosb + sin a sin b
d.
sin (a + b) = sin a cos b + cos a sin b
2.Find all solutions for a triangle with a=140,b=10 and a=3. Round to the nearest tenth.
a.
B = 15.4°; C = 147.6°; c = 20.2
c.
B = 15.4°; C = 134.5°; c = 20.2
b.
B = 16.2°; C = 147.6°; c =20.2
d.
no solutions