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question mark

if cos(x-y) = -1 then cosx + cosy equals to what in integers
a)0
b)1
C)2
d)-1

aadi , 7 Years ago
Grade 11
anser 1 Answers
aadi

Last Activity: 7 Years ago

as cos(x-y)=-1
therefore x-y=(2n+1)pi
(x-y)/2=(2n+1)pi/2
so we can substitute odd multiples of pi/2 to verify this

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