Cos 170×cos 150×cos 130 ×cos 110 evalute
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cos 170*cos150*cos130*cos110=0.188
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Answer:
A=cos(180-10).cos(180-30).cos (180-50).cos (180-70)
A=cos10°×cos 30°×cos 50°×cos 70°
A=cos10°×cos(60-10)×cos(60+10)cos30°
cosalpha×cos(60-alpha)×cos(60+alpha)=1/4cos3alpha
divided by alpha=10
=1/4cos30°-cos30°=1/4(squareroot3/2)
=3/4×4
=3/16
Hope this helped you
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