Co|`Co^(2+)(C_(2)`||`Co^(2+)(C_(1)`|Co, for this cell, `DeltaG` is negative if :

Co | Co^(2+)(C_(2)) || Co^(2+)(C_(1)) | Co , for this cell, DeltaG is negative if :

cos^(2)A+cos^(2)B+cos^(2)C=1-cos A cos B cos C prove that

a(cos C-cos B)=2(b-c)cos^(2)(A)/(2)

A+B=C rArr cos^(2)A+cos^(2)B+cos^(2)C-2cos A cos B cos C=

In a Delta ABC,a(cos^(2)B+cos^(2)C)+cos A(c cos C+b cos B) is equal to

The expression cos^(2)(a+b+c)+cos^(2)(b+c)+cos^(2)a-2cos a*cos(b+c)cos(a+b+c) is indendent of

If A+ B + C = pi, then cos^(2) A + cos ^(2) B + cos ^(2) C is equal to : A) 1 - cos A cos B cos C B) 1 - 2 cos A cos B cos C C) 2 cos A cos B cos C D) 1 + cos A cos B cos C

If : A+B+C=pi, "then" : 1-cos^(2) A-cos^(2)B-cos^(2)C= A) 2 cos A * cos B * cos C B) 2 sin A * cos B * cos C C) 2 cos A * sin B * cos C D) 2 cos A * cos B * sin C

If A+B+C=pi prove that cos^(2) A+cos^(2) B+cos^(2) C=1 - 2cos A cos B cos C .