Question

$sin(25) \cos(65 ) + \cos( 25 ) \sin(65)$
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Answer 1

Answer:

1

Step-by-step explanation:

Its an identity (called Angle Sum Identity):

sin(a+b) = sin(a)cos(b)+cos(a)sin(b)

so after using it on the given question we get:

sin(25)cos(65)+cos(25)sin(65)

= sin(25+65)

= sin(90)

= 1