$\sin^2 heta + \cos^2 heta$ equals:

Question

$\sin^2	heta + \cos^2	heta$ equals:

Accepted Answer

D. $1$

The **Pythagorean identity** $\sin^2	heta + \cos^2	heta = 1$ holds for every real $	heta$.
It comes from Pythagoras applied to the unit circle: any point on it has coordinates $(\cos	heta, \sin	heta)$ with distance 1 from origin
so the sum of squared coordinates is 1.
Companion identities:
- Dividing by $\cos^2	heta$: $1 + 	an^2	heta = \sec^2	heta$.
- Dividing by $\sin^2	heta$: $\cot^2	heta + 1 = \csc^2	heta$.

Answer

$2$

Answer

$0$

Answer

$	an	heta$

$\sin^2\theta + \cos^2\theta$ equals:

Keep practising Unit 3A: Chain Rule and Composite Functions