What is the missing justification in the proof of the pythagorean identity, sin^2x+cos^2x=1 using a right triangle?

D

Step-by-step explanation:

Pythagoras theorem ( a^2 + b^2 = c^2)

The justification that is missing in the following table is:

option: D Pythagorean Theorem

Step-by-step explanation:

Pythagorean Theorem states that in a right  angled triangle if , 'a' is the perpendicular side, 'b' is the base and 'c' is the hypotenuse then:

                       a²+b²=c²

Hence, the justification that is missing in the following proof is the use of Pythagorean Theorem as is stated above.

Hence, option: D is the correct answer to this question.