Find the value of cos 75°-cos15°
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Answer:
-√2/2
Step-by-step explanation:
cos c - cos d = - 2sin (c+d)/2 sin (c-d)/2
cos 75 - cos 15 = - 2sin (75+15)/2 sin (75-15)/2
= - 2sin 45 sin 30
= -2(1/√2)(1/2)
= -1/√2
= -√2/2
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