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cos15 - sin 15

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cos15 - sin 15
  • 1 answers

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

1232+12121232+1212

Solving we get

=  12

Answer.

 

 

 

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