60 লিটারের মিশ্রণে দুধ ও পানির অনুপাত 2:1। যদি এই অনুপাত 1: 2 হয়, তাহলে...

In a mixture of 60 litres, the ratio of milk and water is 2:1. If this ratio is to be 1: 2, then the quantity of water to be further added is:

The sum up to 60 terms of 3/(1^2) + 5/(1^2 + 2^2) + 7/(1^2 + 2^2 + 3^2) + ……. is equal to

cot30^@ - 1/2 xx cosec 60^@ =

({(4) / (tan ^ (2) 60 ^ (@)) + (1) / (cos ^ (2) 30 ^ (@)) - 2sin ^ (2) 45 ^ (@)}) / ( (sin ^ (2) 60 ^ (@) + cos ^ (2) 45 ^ (@)))

((4) / (tan ^ (2) 60 ^ (@)) + (1) / (cos ^ (2) 30 ^ (@)) - 2sin ^ (2) 45 ^ (@)) / (sin ^ (2) 60 ^ (@) + cos ^ (2) 45 ^ (@))

((4) / (tan ^ (2) 60 ^ (@)) + (1) / (cos ^ (2) 30 ^ (@)) - 2sin ^ (2) 45 ^ (@)) / (sin ^ (2) 60 ^ (@) + cos ^ (2) 45 ^ (@))

If 25 + 5 ÷ 2 = 40 , and 35 + 5 ÷ 2 = 60 , then 45 + 5 ÷ 2 = ? 1) 90 2) 70 3) 60 4) 80

(sin ^ (2) 30 ^ (@) cos ^ (2) 45 ^ (@) + 4tan ^ (2) 30 ^ (@) + (1) / (2) sin ^ (2) 90 ^ (@) + (1) / (8) cot ^ (2) 60 ^ (@)) =?

frac(cos60^@ + sin 60^@)(cos60^@- sin 60^@) is equal to (A) -(sqrt3 +2) (B) -1 (C ) (sqrt3 -2) (D) (sqrt3 + 2)