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Which of the following is the fundamental Pythagorean identity?

Class 10Trigonometric IdentitiesTrigonometry

A $s i n^{2} A + co s^{2} A = 1$
B $s i n^{2} A - co s^{2} A = 1$
Csin A + cos A = 1
Dsin A * cos A = 1

Step-by-Step Solution

By definition, for any angle A, si

n^{2}

A + co

s^{2} A = 1

. This is the basic trigonometric identity.

Answer: A)

s i n^{2} A + co s^{2} A = 1

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