Is sin^2(a)+cos^2(a)=1 ?

The answer to whether sin^2(a)+cos^2(a)=1 is True

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prove sin^2(a)+cos^2(a)=1

prove

sin^{2} (a) + cos^{2} (a) = 1

True

Solution steps

sin^{2} (a) + cos^{2} (a) = 1

Use the Pythagorean identity:

cos^{2} (x) + sin^{2} (x) = 1

\Rightarrow True

csch^{2} (x) = coth^{2} (x) - 1

\frac{1}{sec ( x ) + tan ( x )} = sec (x) - tan (x)

\frac{tan ( y )}{csc ( y )} = \frac{1}{cos ( y )} - \frac{1}{sec ( y )}

\frac{1 + sin ( x )}{cos ( x )} = sec (x) + tan (x)

2 tan (x) sec (x) = \frac{1}{1 - sin ( x )} - \frac{1}{1 + sin ( x )}