This two math.. Please do this..
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cos2x-cos2a /cosx-cosa dx
2cos²x-1-(2cos²a-1)/cosx-cosa dx
2cos²x-1-²cos²a+1 dx
2 ( cosx + cosa )dx
2[sinx+cosx .(x) +c
2[xcosa+sinx]+c
2cos²x-1-(2cos²a-1)/cosx-cosa dx
2cos²x-1-²cos²a+1 dx
2 ( cosx + cosa )dx
2[sinx+cosx .(x) +c
2[xcosa+sinx]+c
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