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Evaluate the arc cosine without a calculator

I make short, to-the-point online math tutorials. I struggled with math growing up and have been able to use those ...
YouTube on MSN

Be careful typing law of cosines in your calculator

I make short, to-the-point online math tutorials. I struggled with math growing up and have been able to use those ...

Simple math equation can be solved using 5th-grade trick, yet many are still stumped — can you figure it out?

Over the weekend, user @BholanathDutta shared the equation that looked relatively simple to his thousands of followers, until it wasn’t, stumping many online who immediately regretted snoozing through ...