Trigonometric ratios5

Mathematics
Tutor: None Selected Time limit: 1 Day

Find the cosine of -210°

Find the cosine of -135°

Find the cosine of -60°

Find the cosine of 390°.

Oct 28th, 2014

cos (-210) =cos(210) =-cos(30) =-0.866

Cos (-135) = cos(135) =-sin(45) = -0.7071

cos(-60) =cos(60) =0.5

cos(390) =cos(30)= 0.866 

Oct 28th, 2014

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Oct 28th, 2014
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