cosec θ + cot θ =12 হলে, cosec θ + cot θ =কত?
i. ∠ACD = ∠ABC + ∠BAC
ii. ∠ACE = ∠BAC
iii. ∠DCE = ∠ABC
নিচের কোনটি সঠিক?
x5+1x5= কত?