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Question: Why won't my maple solve cos, tan or tan?

Question:Why won't my maple solve cos, tan or tan?

Peter_Pan 10 Maple 2019
trig sin
May 22 2020
2

Hello, so my maple won't solve any function involving either cos, tan or sin. Has anyone experienced this before or know how to fix it? 

For example i need to find: cos(30), but it comes up as cos(30) after I hit enter. 

 

Many thanks to anyone who tries to help! :)
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