For `2<=r<=n,((n),(r))+2((n),(r-1))+((n),(r-2))` is equal to

For any triangle ABC,prove that (b^(2)-c^(2))/(a^(2))sin2A+(c^(2)-a^(2))/(b^(2))sin2B+(a^(2)-b^(2))/(c^(2))sin2C=0

Find the mode for the following series: 2.5,2.3,2.2,2.2,2.4,2.7,2.7,2.5,2.3,2.2,2.6,2.2

2 + 2 + 2 + 2 + 2 of 2 = ?

Evaluate : 2/7 times ( -2/2 ) - 2/2 times 2/2 - 2/2 times 2/7

Evaluate : 2/7 times (-2 )/2 - 2/2 times 2/2 - 2/2 times 2/7

2 + 2 + 2 + 2 + 2 = ?

The nth term of the given sequence 3/ (1^ 2) ⋅ 5/ (1^ 2 + 2^ 2) ⋅ 7/ (1^ 2 + 2^ 2 + 3^ 2) ⋅ 9/ (1^ 2 + 2^ 2 + 3^ 2 + 4^ 2)

(2+sqrt(2)+(1)/(2+sqrt(2))+(1)/(sqrt(2)-2)) simplifies to 2-sqrt(2)(b)2(c)2+sqrt(2)(d)2sqrt(2)