Why does cos(t)=x and sin(t)=y?

Trigonometry Identities: sin(-x) = - sin(x) and cos(-x) = cos(x)

What is sin(x)sin(x) + cos(x)cos(x) = ?

Visualizing the derivative of sin(x)

Verify the Trig Identity (cos(x)/sin(x)) + (sin(x))/(cos(x)) = sec(x)csc(x)

Derivative of sin x and cos x

Derivative of sin(x) and cos(x), PROOF

Trig Help: Graphing y = sin x + cos x.

Precalculus Exam 4 Review part 1

sin(-x) = -sin(x). sin(x) is an odd function. cos(-x) = -cos(x) cos(x) is an even function.

Derivative of Sine and Cosine Functions | Calculus

why sin(2x)=2sin(x)cos(x)

Trigonometric Equation: Solve cos (x) - sin (x) = 0

Sin Cos Tan, Teri Bandi Meri Fan #shorts

sin(x)+cos(x)=sqrt(2) | Trigonometry

Cos (Sin x) or Sin (Cos x), Which is Greater ?

Proof why tan(x) = sin(x)/cos(x)

Easy Way to Remember Derivatives of Trigonometry Ratios #shorts | How to Remember Derivatives Easily

And You Thought Trigonometry Was Pointless…

Verify the Trigonometric Identity cos(x - pi/2) = sin(x)