1. BY: MARIAH & JON 13.4 INVERSE OF SINE AND TANGENT

2. INVERSE SINE Say that the sine of theta equals A. To find the inverse sine you would put that sine to the -1 of whatever A equals would then equal theta. A can not be less than -1 or greater than 1.

3. EXAMPLE A now equals -1. Inverse the equation so sine of theta now equals A or now -1. Look at your chart if it’s a special angle! If so find what degree the sine of 1 equals. Since A is negative, theta will also be negative. Also once you find the angle convert it to radians as well. If its not a special angle use your calculator.

4. LET’S PRACTICE

5. ANSWER

6. INVERSE TANGENT Inverse tangent works the same as inverse sine. Say that the tangent of theta equals A. The inverse tangent of A would then equal theta A can be anything because it ranges from negative infinity to positive infinity. Your answer, or theta, is the same ranges for inverse sine.

7. EXAMPLE A now equals the square root of 3 over 3. Inverse the equation so the tan of theta now equals A, or now the square root of 3 over 3. Again look at your chart to see if it’s a special angle! Put your answer in degrees and radians and don’t forget to see if it’s negative. If not special use a calculator!

8. LET’S PRACTICE

9. ANSWER