Sin(90-A), Sin(90+A), Cos(180-A), Cos(180+A), Sin(270-A), Sin(270+A),Cos(360-A) How Why Trigonometry

180° gives you the same “triangle" really just a line that you get at 0° but in the opposite direction. So cos 180°=-cos 0°=-1.Read more

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Therefore, the value of cos 180° is -1. Cos 180°= -1. Upvote ·. Profile photo for Lee. Lee. Studied Mathematics and Physics & ...Read more

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Because the two sides have been shown to be equivalent, the equation is an identity. cos(180°−θ)=−cos(θ) ...Read more

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The value of cos 180 degrees is -1. Cos 180 degrees in radians is written as cos (180° × π/180°), ie, cos (π) or cos (3.141592. . .).Read more

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So I've found this out on a calculator, cos(π²), π in radians, is not equal to cos(180²), 180 in degrees. Can anyone give an explanation?Read more

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cos (180° - θ) = cos (90° + 90° - θ). = cos [90° + (90° - θ)]. = - sin (90° - θ), [since cos (90° + θ) = -sin θ]. Therefore, cos (180° - θ) = - cos θ, [since ...Read more

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Answer: The value of cos 180° is -1. Trigonometry: The relationship between the sides and angles of triangles is the subject of this mathematical field ...Read more

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Learn the reason behind cos 180 degrees equaling -1. Gain a deeper understanding of the unit circle and the cosine function.

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