Why is cos(180 - theta) = -cos(theta) and sin(180 - theta) = sin(theta)?

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

Write cos(180 - theta) as a trigonometric function of theta

prove cos(180 degrees - theta) = -cos theta

Sum and Difference Identities: Evaluate sin(x-90) and cos(180+x)

trigonometry class 11 basics formula ll why sin(180-θ) = sinθ, cos(180-θ) = -cosθ, tan(180-θ) = tanθ

Trigonometry Concepts - Don't Memorize! Visualize!

prove sin(180 - theta) = sin theta

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trigonometry class 11 basics formula ll why sin(180+θ) =-sinθ, cos(180+θ) = -cosθ, tan(180+θ) = tanθ

Graph to show that sin(180+x) = -sin x

Proof of cos(180-x),cos(180+x)..

Trigonometric Ratios l Sin(90-theta), Sin(90+theta), Sin(180-theta), Sin(180+theta) | CAST Diagram

Trick for doing trigonometry mentally!

Sin 180-Theta || Sin 180 Minus Theta || Sin 180-Theta Barabar || Sin(180°-θ) || Trigonometry

TRIGONOMETRIC RATIOS FOR ALLIED ANGLES || SIN (180 + X ) || COS ( 180 + X ) || TAN (180 +X )

Cos 180-Theta || Cos 180 Minus Theta || Cos 180-Theta Barabar || Cos (180°-θ) || Trigonometry

PROOFS TRIGONOMETRIC RATIOS FOR ALLIED ANGLES || SIN (180 - X ) || C0S (180 - X ) || TAN (180 - X )

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