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20-07-2017
Mathematics

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The expression sin 50 cos 40 + cos 50 sin 40 is equivalent to

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mreijepatmat mreijepatmat

23-07-2017

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

a= 50° and b=40°, then

sin(50+40) = sin 50° . cos 40° + cos 50° . sin 40°

sin(50+40) = sin 90° = 1 and

sin 50° . cos 40° + cos 50° . sin 40° = 1

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