1 .If tanA=1/3 and tanB=1/7 (both A and B are acute),calculate 50sin(2A +B)

2.1Prove that sin2A+2cosA-2cos^3A/1+sinA =sin2A
2.2 for which values of A in the interval[-360;360] is the identity in 2.1 undefined?
3.If tanB=3/4 , 0<B<90 , prove that 4cos2B+3sin2B=4
4.Prove that (1/cos^2B)cos2B=2-1/cos^2B)
5. Write sin2A and cos2A in terms of sinA and cosA

see solution above of the same question

Please don't switch names.