cos10-cos50=cos20
PROVE THIS..
I think something is wrong in this question.
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yes there is an problem in this question answer will be -root 3/2sin20
how,
we know that cosa-cosb = -sin(a+b/2)sin(a-b/2).
how,
we know that cosa-cosb = -sin(a+b/2)sin(a-b/2).
katyayni53:
thank you
it was my answer also
has that boy really copied from something
yes
ok..
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