Sin58 sin 13 + cos 58 cos13
Answers
Answered by
3
cos(A-B)
=cos(58-13)
=cos(45)
1/√2
=cos(58-13)
=cos(45)
1/√2
Answered by
1
cos(A-B)=cosAcosB+sinAsinB
so cos58cos13+sin58sin13
=cos(58-13)
=cos45
=1÷1.414
so cos58cos13+sin58sin13
=cos(58-13)
=cos45
=1÷1.414
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