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Integrate the functions 1/(cos(x-a)cos(x...

Integrate the functions `1/(cos(x-a)cos(x-b)`

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Given `1/(cos(x-a)cos(x-b)`
`=1/sin(a-b)[(sin(a-b))/(cos(x-a)cos(x-b))]`
`=1/sin(a-b)[(sin(x-b)-(x-a))/(cos(x-a)cos(x-b))]`
`=1/sin(a-b)[sin(x-b)cos(x-a)-cos(x-b)sin(x-a)]/(cos(x-a)cos(x-b))`
...
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