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Simplification of Mathematical Problems: cos( 180? -a)sin(-a)cos(360? -A.
(1) Simplified cos(90? -α)+sin( 180? +α)-tan(360? +α)/tan( 180? +α)+cos(-α)-sin(90? +α)= sinα-sinα-tanα/tanα+cosα-cosα=- 1

(2) verification: [sin? α/(cosα+sinα)]+[cos? α/( 1+tanα)]= 1-sinαcosα

∵cos? α/( 1+tanα)]=cos? α/(cosα+sinα)

∴[sin? α/(cosα+sinα)]+[cos? α/( 1+tanα)]=(sin? α+cos? α)/(cosα+sinα)=cos? α+sin? α-sinαcosα= 1-sinαcosα

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