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Find the value of cos 225° |
-0.7071 -0.866 0.7071 0.866 |
-0.7071 |
cos 225° = cos ( 180° + 45° ) { we know , cos ( 180° + A ) = -cosA } = - cos45° = - \(\frac{1 }{√2}\) = - 0.7071 |
