Questions 1 to 6. In terms of approaching the questions, how should i do it. Full solutions needed, thank you!

Question

Questions 1 to 6. In terms of approaching the questions, how should i do it. Full solutions needed, thank you!

/2 1)a ) 0 cos 2 d /2 0 1 cos 2 2 d , use 2cos 1 cos 22 /2 1 sin 2 sin a ,a 0 , use cos a d a 2 2 2 01 1 0 sin sin 0 2 24 4sin 2 1 / t 1 12 b) t 2 dt , put 1111 x 2 dt dx, t x 2 and t x t...