Sin 8^/3 cos 23^/6 cos 13^/6 sin 35^/6

Garrison of 1140 main is provision for 40 days. After 16 days on full patients the Garrison is reduced by 152 man by captcha, but the existing provisions are increased by 1 upon 12. For how many days can the reduced Garrison hold out?

Prove that √7 is an irrational

If cor thera =7/8, find (1+sin theta) (1-sin theta) /(1+cos theta) (1- cos theta) 

If cor thera =7/8, find (1+sin theta) (1-sin theta) /(1+cos theta) (1- cos theta)