27.5k views
5 votes
Can someone explain how to do this? thank you!

Can someone explain how to do this? thank you!-example-1
User Yunxia
by
8.9k points

1 Answer

4 votes
The answer will be Negative

Write sin(
(5 \pi )/(4)) as sin(
\pi+
\frac{ \pi } {4})

Using the summation identity will be:
=sin(
\pi)+cos(
\pi)sin(
( \pi )/(4))

By following the trivial identity, you should get:
=
0*
( √(2))/(2)+(-1) \frac{\sqrt 2} {2}

Remove the parentheses on -1, then multiply
=0*
\frac{ \sqrt 2} {2}-1* \frac{ \sqrt 2} {2}

You should get:

- \frac{ \sqrt 2} {2}
User Natz
by
8.1k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories