MCQ
If $m, n$ are any two odd positive integer with $n< m,$ then the largest positive integers which divides all the numbers of the type $m^2- n^2$ is:
- A$4$
- B$6$
- ✓$8$
- D$9$
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$y = a\,{\cos ^2}x + 2b\,\sin x\cos x + c\,{\sin ^2}x$
and $z = a{\sin ^2}x - 2b\sin x\cos x + c{\cos ^2}x,$ then