=(sin a(1-cos a)-sin a(1+cos a))/(1-cos a)(1+cos a)=(sin a-sin a*cos a-sin a-sin a*cos a)/(1-cos²a)=-2sin a*cos a/ sin²a=-2cos a/sin a=-2ctg a
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
=(sin a(1-cos a)-sin a(1+cos a))/(1-cos a)(1+cos a)=(sin a-sin a*cos a-sin a-sin a*cos a)/(1-cos²a)=-2sin a*cos a/ sin²a=-2cos a/sin a=-2ctg a