Question

Find the value of cos 105 degrees without using a calculator

Answer 1

Answer:

cos 105°

105°=60°+45°

cos 60+cos45

cos 60=1/2

cos 45=1/√2

1/2+1/√2=2+√2/2√2

Answer 2

Answer:

To find value of cos 105°, we Nedd to add cos 60° and cos 40°

Cos60°+ cos40°=cos 105°

1/2 + /2/2= cos105°

1.5= cos105°

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