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Let their marks be A, R and S
Therefore, A + (R + S)/2 = 65
R + (S + A)/2 = 69
S + (A + R)/2 = 76
(as it has been mentioned that the marks of one student are added to the average of marks of other two students) (In all possible combinations means, either marks of student 1 are added to average marks of students 2 and 3, or marks of student 2 are added to average marks of students 1 and 3, or marks of student 3 are added to average marks of students 1 and 2)
+91-85588-96644
+ y2 cot x = 2 cos x, y(
) = 1, is
, 
has the value
Correct opton is (a). 2(y^2)sin(x) cos(2x)=1 2(y^2)sin(x)=1-cos(2x) 2(y^2)sin(x)=2(sin(x))^2 y^2=sin(x) <=>correct option is (a).