1)cos А/ 2 sinА cosА= 1/2sin a
2)2sinXcosX/sinX - cosX= 2cosX-cosX=cosX
3)cos^2B-sin^2B+sin^2B=cos^2B
4) cos^2X-sin^2X/cosX-sinX - cosX= cosX+sinX-cosX=sinX
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1)cos А/ 2 sinА cosА= 1/2sin a
2)2sinXcosX/sinX - cosX= 2cosX-cosX=cosX
3)cos^2B-sin^2B+sin^2B=cos^2B
4) cos^2X-sin^2X/cosX-sinX - cosX= cosX+sinX-cosX=sinX