Math, asked by Akramkhan7633, 18 days ago

Find the value of cos 75°-cos15°

Answers

Answered by gsai1595
0

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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