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Ecaluate the Limits (calculus)

please...help me with this...

Im having a hard time calculating this on my calculator... for the fact that I didnt knew what button (sine squared) should i press

(Thinking)(Thinking)(Thinking)

by the way...the answer that you've seen in the photo was just the answer in an application when Im trying to calculate it over there....**But the real answer in the answers key is 3** (Wait)

...I REALLY NEED YOUR HELP GUYS (Doh)(Crying)(Worried)(Time)

Re: Ecaluate the Limits (calculus)

just plug $\dfrac \pi 6$ in and evaluate it. There's nothing tricky here at all.

If you are asking how to plug this into your calculator you're in the wrong place.