5 [16 points] Verify the following identities: 1 + cos r - sin r COST COST + Sinc (a) = cos r tan r 1 + cosr + sin r 1 + sin r (b) CSC T + Sec T sin (2.r.) (c) In | tanasecr| = In | sin|-2In | cosx) (d) tan(r-7) = tan (e) tan I 1 + cos(2r)