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

If 0 degrees < theta < 90 degrees, is sin theta equal to cos (90 degrees theta), and for what reason?

Why sin(90-θ)=cosθ

Riddle me this: You're always right, what is your sine? Answer: #1

trigonometry - How would a triangle for sin 90 degree look - Mathematics Stack Exchange

SOLVED: Prove that sin(theta) cos(90 degrees - theta) cos(theta) / sin(90 degrees - theta) + cos(theta) sin(90 degrees - theta) sin(theta) / cos(90 degrees - theta) is equal to 1.

Trigonometric Functions of Any Angle - Trigonometry

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sin(90-A)/cos(90-A)=होगा

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View question - Why is the sine of 90 degrees equal to 1?

What can you say about the values of sin A and cos A, as the value of angle A increases from { 0 }^{ circ } and { 90 }^{ circ }?