What is sin(-90 degrees)?

Consider that -90° corresponds to 270° (the minus sign is to turn clockwise instead of counter-clockwise): so: sin(-90°)=sin(270°)=-1

Sine-Cosine-Tangent

Solved suppose that sin a=15/17 and 90 degrees < a < 180

Solved Points A, B, and C are plotted on the unit circle. y

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Prove sin(90-A)=cosA.avi

In triangle ABC angle C = 90 degrees Prove That, [(1 - sin A)/(1 + co - askIITians

Instruction on how to use Bradis Table of sines and cosines from 0 to 90 degrees. Example 2

Why sin(90-θ)=cosθ

Lesson plan Class 10th Time 35min. Subject Mathematics - ppt video