1. find csc x if sinx+cotxcosx=root3(更号3)
2.verify that sin( pi +theta)=-sin theta is an identity
3.solve cotx +2 cotxsin(平方)x is an identity.
谁能帮助我..跪求了。
2.verify that sin( pi +theta)=-sin theta is an identity
3.solve cotx +2 cotxsin(平方)x is an identity.
谁能帮助我..跪求了。