@=(п;3п/2)⇒3 чет
4sin(5п/[email protected])=4cosα
[email protected]=-0.6
cosα=√1-sin²α=√1-0.36=√0.64=±0.8⇒-0.8
4cosα=4*(-0.8)=-3.2
@=(п;3п/2)⇒3 чет
4sin(5п/[email protected])=4cosα
[email protected]=-0.6
cosα=√1-sin²α=√1-0.36=√0.64=±0.8⇒-0.8
4cosα=4*(-0.8)=-3.2