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∫ (sin2x + 2 tanx)/(cos6 x + 6 cos2 x + 4)) dx = 

(a) 2√((1 + cos2 x)/(cos7 x)) + c 

(b) tan–1 (1/√2) x √((1 + cos2 x)/(cos7 x)) + c 

(c) (1/12) log ((1 + cos2 x)/(cos7 x)) + c 

(d) (1/12) log (1 + (6/cos4 x) + (4/cos6 x)) + c

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