Negative angle identities -Trigonometry formulas

Negative angle identities

1. sin(t)=sin(t)
2. cos(t)=cos(t)
3. tan(t)=tan(t)
4. cot(t)=cot(t)
5. sec(t)=sec(t)
6. cosec(t)=cosec(t)

Example 1:

What is \(\cos \left(-\frac {3\pi }{4}\right) \)?

Solution:

cos3π4=cos3π4=22

Example 2:

What is \(\sin \left(-\frac {\pi }{2}\right) \)?

Solution:

sinπ2=sinπ2=1

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