How do you find the exact value of $sin50cos25-cos50sin25$ using the sum and difference, double angle or half angle formulas?

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Answer 1 · 2018-05-11T04:44:41

sin 25

Use trig identity:
sin (a - b) = sin a.cos b - sin b.cos a
In this case:
sin (50 - 25) = sin 25

How do you find the exact value of sin50cos25-cos50sin25sin50cos25-cos50sin25 using the sum and difference, double angle or half angle formulas?