Question

prove that
sin theta upon 1+cos theta is equal to 1 - sin theta - cos theta upon sin theta- 1 - cos theta​

Answer 1

New length =(l+2)m, New breadth =(b−3)m

New area =(l+2)(b−3)=lb+2b−3l−6

⇒lb+66=lb+2b−3l−6⇒2b−3l=72

⇒2b−3(70−b)=72⇒2b−210+3b=72⇒5b=282

⇒b=56.40m, then l=70−b=70