what is the value of cos 480-sin 420
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3
Answer:
1.366
Step-by-step explanation:
cos(480)-sin(420)
=cos(360+120)-sin(360+60)
=cos(120)-sin(60)
=cos(90+30)-sin(60)
=-sin(30)-sin(60)
=-1/2-root3/2
=-1.366
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