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There are quite a few! And the list is growing... :)

Like a previous commenter noted, the instant math portion of google is a good feature. Any way to do this with DDG?

Simple queries are done in just the same way: https://duckduckgo.com/?q=42*PI

More complex queries are typically done with Wolfram|Alpha. This goes a long way: https://duckduckgo.com/?q=graph+y+%3D+x%2Bcos^2%28sqrt%2842*...