cos(A+B) = cosA . cosB - sin A . sinB in which A=60° and B=30°
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cos(60+30) = cos60 * cos30 - sin60 * sin30
cos90 = 1/2 * (root3/2) - (root3/2) * 1/2
0 = (root3/4) - (root3/4)
0 = 0
hence, proved
i hope this will help you
-by ABHAY
cos90 = 1/2 * (root3/2) - (root3/2) * 1/2
0 = (root3/4) - (root3/4)
0 = 0
hence, proved
i hope this will help you
-by ABHAY
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