What is the pythagorean identity

The most common trigonometric identities are those involving the Pythagorean Theorem...

Step-by-step explanation:

The Pythagorean trigonometric identity, also called the fundamental Pythagorean trigonometric identity or simply Pythagorean identity is an identity expressing the Pythagorean theorem in terms of trigonometric functions..

hi,

3. 12.15, you are correct.

4.2.01, your first digit is correct,

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-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8