1)=(sin^4α+sin²α·cos²α)+cos²α=sin²α(sin²α+cos²α)+cos²α=sin²α+cos²α=1.
2)=(sin²α-cos²α)(sin²α+cos²α)-sin²α+cos²α=sin²α-cos²α-sin²α+cos²α=0.
( ⇅ =1 )
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1)=(sin^4α+sin²α·cos²α)+cos²α=sin²α(sin²α+cos²α)+cos²α=sin²α+cos²α=1.
2)=(sin²α-cos²α)(sin²α+cos²α)-sin²α+cos²α=sin²α-cos²α-sin²α+cos²α=0.
( ⇅ =1 )