Step-by-step explanation:
to proof
we know that
replace 2x by
then ,
by using cos2x formula
using formula ;
(a-b)² = a²-b²
sin²x+cos²x= 1
therefore ;
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Step-by-step explanation:
Hope this attachment will help you
Question ;
to proof
solution ;
we know that
replace 2x by
then ,
by using cos2x formula
using formula ;
(a-b)² = a²-b²
we know that
sin²x+cos²x= 1
then ,
therefore ;
I hope it helps you!