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this is an invalid question because of cosx and cosy have max value 1 so 5cosx + 5cosy can be maximum 10 not 13. plzz chk
The problem is wrong i think.....
5 cos x + 12 cos y = 13 is the correct problem
this question is wrong since max value of cosx or cosy can be 1 .
and if cox=cosy=1
then max value of 5 cosx+5cosy
=5*1+5*1 =10
which is less than 13
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