cosx=cos60.cos300+sin60.sin30
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solve it with using identities
arifalam106:
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cos x= cos 60*cos30+sin60*sin30
cos x=1/2*root3/2+root 3/2*1/2
cos x=root3/4+root3/4
cos x =root3+root3/4
cos x = 2 root 3/4
cos x = root3/2
cos x = cos 30
x=30 ( cos and cos get cancel).
cos x=1/2*root3/2+root 3/2*1/2
cos x=root3/4+root3/4
cos x =root3+root3/4
cos x = 2 root 3/4
cos x = root3/2
cos x = cos 30
x=30 ( cos and cos get cancel).
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