Find the value of cos 225°
Answer & explanation
Correct answer: option 1
cos 225°
= cos ( 180° + 45° )
{ we know , cos ( 180° + A ) = -cosA }
= - cos45°
= - \(\frac{1 }{√2}\)
= - 0.7071
Find the value of cos 225°
Correct answer: option 1
cos 225°
= cos ( 180° + 45° )
{ we know , cos ( 180° + A ) = -cosA }
= - cos45°
= - \(\frac{1 }{√2}\)
= - 0.7071