Consider that -90° corresponds to 270° (the minus sign is to turn clockwise instead of counter-clockwise): so: sin(-90°)=sin(270°)=-1
Solving Sin (90+Theta) = Cos - Explanation
sin(90 - x), sin(90 - A), sin(90 - theta)
What is sin(-90 degrees)?
Find the exact values of the following. cos 270 degrees = 90 degrees, value = 0. Sin 180 degrees =
Why sin(90-θ)=cosθ
How is Cos 90°=0, Cos 0°=1 and Sin 90°=1? - Quora
Sin 90 Degrees I Formula and its Derivation I Sample Examples
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functions - Trouble understanding sine, cosine of angles greater than $90$ degrees - Mathematics Stack Exchange
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Cofunction Identities in Trigonometry (With Proof and Examples) - Owlcation
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Lesson plan Class 10th Time 35min. Subject Mathematics - ppt video
