1.

int(1+cosalphacos x)/(cosalpha+cosx)dx=

Answer»

`xcosalpha-sinalpha LOG|(COT((ALPHA)/(2))+tan((x)/(2)))/(cot((alpha)/(2))-tan((x)/(2)))|+C`
`xcosalpha+sinalpha log|(cot((alpha)/(2))+tan((x)/(2)))/(cot((alpha)/(2))-tan((x)/(2)))|+c`
`xcosalpha-sinalpha log|(tan((x)/(2))+tan((alpha)/(2)))/(tan((x)/(2))-tan((alpha)/(2)))|+c`
`xcosalpha+sinalpha log|(tan((x)/(2))+tan((alpha)/(2)))/(tan((x)/(2))-tan((alpha)/(2)))|+c`

ANSWER :B


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