1.

int(dx)/(cosa+cosx)=

Answer»

`(" cosec "a)LOG|(cot((a)/(2))+TAN((x)/(2)))/(cot((a)/(2))-tan((x)/(2)))|+C`
`(" cosec "a)log|(cot((a)/(2))-tan((x)/(2)))/(cot((a)/(2))+tan((x)/(2)))|+c`
`(" cosec "a)log|(tan((x)/(2))+tan((a)/(2)))/(tan((x)/(2))-tan((a)/(2)))|+c`
`(" cosec "a)log|(tan((x)/(2))-tan((a)/(2)))/(tan((x)/(2))+tan((a)/(2)))|+c`

Answer :A


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