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

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

Trigonometrical Ratios of (90° - θ)

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

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

c# - I understand that Sin and Cos are in radians, but why I am still off by 90 degrees? - Stack Overflow

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How do you find the exact value of sin(-90)?

Sin 90 Degrees Value, Calculation, Periodicity & Examples

What does sin(90°)=1 mean? - Quora

Why sin(90-θ)=cosθ