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is it right to say cos (60+30)=cos 60cos 30-sin60sin30?justify​

By Abigail

is it right to say cos (60+30)=cos 60cos 30-sin60sin30?justify​

About the author
Abigail

Monika takes 1/6 hours to walk to the playground and 1/3 hour to walk from the playground to school. how much time does it take he

The exposure time of a
f
camera lens at the 2.8
1
setting is 200 second. The
correct time of exposure at<

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