Question 1139668
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It is just for &nbsp;<U>THE &nbsp;THIRD &nbsp;TIME</U>&nbsp; I see this problem coming to the forum.



See the link


<A HREF=https://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.1139576.html>https://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.1139576.html</A>


https://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.1139576.html



It is just the time to memorize it &nbsp;FOREVER, &nbsp;isn't  it ? . . .