cos15 - sin 15
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Account Deleted 3 years, 11 months ago
Write it as cos (45-30) - sin(45-30)
Now open both the functions as
= cos 45 cos 30 + sin 45 sin 30 - sin 45 cos 30 + sin 30 cos 45
Putting the values as learned in class X
1√2∗√32+1√2∗12−1√2∗√32+12∗1√2
Solving we get
= 1√2
Answer.
4Thank You