Find the common difference of the arithmetic sequence. 9, 13, 17, 21, . ..
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15. The terminal side of intercepted the unit circle at:
(0,-1).
This implies that:
This implies that:
16) We have that: .
We illustrate this on the right triangle and apply the Pythagoras Theorem as follows:
Using the mnemonics SOH-CAH-TOAH, we have:
17. We want to verify that:
Verifying from the LHS
Recall that from the Pythagorean identity:
18. We have:
When , we have
When ,
We can see this is not defined for all real values of x.
