The value of cos 80°cos 20°+sin80°sin20°
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0
Answer:
1/2
Step-by-step explanation:
cosacosb+sinasinb=cos(a-b)
=cos(80-20)
=cos60°
=1/2
Answered by
0
The value is found as :-
Cos80•Cos20 + sin80•sin 20
=> cos80• sin80 + cos20• sin 20
=> 1 + 1 = 2
Cos80•Cos20 + sin80•sin 20
=> cos80• sin80 + cos20• sin 20
=> 1 + 1 = 2
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