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1 December, 10:46

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

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  1. 1 December, 11:04
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    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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