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Trigonometric Identities

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Across
Two angles with the same initial and terminal sides but possible different rotations
The sum of the squares of the lengths of the legs of a right triangle equals the square of the length of the hypotenuse
A test to determine if a function is one-to-one and has an inverse function
The sum of two positive angles is 90 degrees
The cosine of an acute angle equals the sine of 90 degrees minus the measure of the same acute angle.
Tangent and its reciprocal, cotangent, are positive
The sine of an angle divided by the cosine of the same angle
The positive acute angle formed by the terminal side of an acute and the x-axis.
Sine of (-x) equals negative sine of (x)
Down
Sine squared (x) plus cosine squared (x) equals 1
All trig functions are positive
Cosine of (-x) equals cosine of (x)