化简,①(2cos²α-1)/(1-2sin²;) ②(1+tan²α)cos²α
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化简,①(2cos²α-1)/(1-2sin²;) ②(1+tan²α)cos²α
化简,①(2cos²α-1)/(1-2sin²;) ②(1+tan²α)cos²α
化简,①(2cos²α-1)/(1-2sin²;) ②(1+tan²α)cos²α
,①(2cos²α-1)/(1-2sin²;)
=cos2α/cos2α
=1
②(1+tan²α)cos²α=cos²α+sin²α=1