in a triangle ABC, cos A=sin B/sin C +sin C/ sin B -sin2A/sin B.sin C
in a triangle ABC, cos A=sin B/sin C +sin C/ sin B -sin2A/sin B.sin C

Last Activity: 3 Years ago

Last Activity: 3 Years ago

Last Activity: 3 Years ago

Last Activity: 4 Years ago

Last Activity: 4 Years ago