integrate the following........
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chk ur ans.................
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Here,
∫(cos²x - sin²x )dx/√(1 +cos4x)
⇒∫(cos²x -sin²x ).dx/√(2cos²2x)
⇒1/√2 ∫.(cos²x - sin²x)dx/cos2x
⇒1/√2∫.cos2x.dx/cos2x
⇒1/√2∫dx
⇒1/√2.x + c
∫(cos²x - sin²x )dx/√(1 +cos4x)
⇒∫(cos²x -sin²x ).dx/√(2cos²2x)
⇒1/√2 ∫.(cos²x - sin²x)dx/cos2x
⇒1/√2∫.cos2x.dx/cos2x
⇒1/√2∫dx
⇒1/√2.x + c
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