sin58°sin13°+cos58°cos13°
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Answered by
2
Cos(x-y)=cosx cosy+sinx siny
sin58°sin13°+cos58°cos13°=cos(58-13)
=cos45°
=1/√2
sin58°sin13°+cos58°cos13°=cos(58-13)
=cos45°
=1/√2
Answered by
0
This is a formula, which is basically equal to sin(58+13)
This is equal to sin(71)
Hope this helps..
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