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trig identities

1.

sinx

1/cscx

2.

cosx

1/secx

3.

tanx

1/cotx

4.

cscx

1/sinx

5.

secx

1/cosx

6.

cotx

1/tanx

7.

sin^2x + cos^2x

1

8.

1 - cos^2x

sin^2x

9.

1 - sin^2x

cos^2x

10.

1 + tan^2x

sec^2x

11.

sec^2x - tan^2x

1

12.

sec^2x - 1

tan^2x

13.

1 + cot^2x

csc^2x

14.

csc^2x - 1

cot^2x

15.

csc^2x - cot^2x

1