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2. Use the SIN , COS , or TAN key to calculate a<br />

trigonometric ratio.<br />

To find the value of sin 54°, press SIN 5 4 )<br />

ENTER .<br />

3. Use SIN 21 , COS 21 , or TAN 21 to calculate an angle.<br />

To find the angle whose cosine is 0.6, press 2ND<br />

. 6 ) ENTER .<br />

COS<br />

Working with Radians<br />

1. Put the calculator in radian mode.<br />

Press MODE . Scroll down and across to Radian. Press ENTER .<br />

2. Use the SIN , COS , or TAN key to calculate a<br />

trigonometric ratio.<br />

To find the value of sin p , press<br />

4<br />

SIN<br />

2ND<br />

^<br />

4<br />

4<br />

)<br />

ENTER<br />

.<br />

3. Use SIN 21 , COS 21 , or TAN 21 to calculate an angle.<br />

To find the angle whose cosine is 0.6, press<br />

. 6 ) ENTER .<br />

2ND<br />

COS<br />

NEL<br />

REVIEW OF TECHNICAL SKILLS APPENDIX 605

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