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How do you simplify $cos35sin55 + cos55sin35$ ?

1 Answer

Jun 17, 2016

1

Explanation:

$cos35sin55 + cos55sin35$

$=sin55cos35 + cos55sin35$

Applying formula $SinAcosB+CosA sinB= sin(A+B)$

we get

$=sin55cos35 + cos55sin35=sin(55+35)=sin90=1$

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