Question: Please use your own answer and solution, do not copy from other website or I will have to report. Write neatly, thank you! 4. Show

Please use your own answer and solution, do not copy from other website or I will have to report. Write neatly, thank you!

4. Show that: a) 2tan-1 1 + tan -1 -JH 4 b) sin 1 c-1 r+1 = 2 tan -1 x - for x 2 0
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