Cos 15= cos45 cos30 +sin45 sin30
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co15=cos (45-30)
》cos (x-y)=cosx cosy +sinx siny
》cos45×cos30+sin 45× sin30
》1/root2×root3/2+1/root2×1/2
》root3/2root2+1/2root2
》root3+1/2root2
I hope this is helpful if so mark as brainliest answer plzzz
》cos (x-y)=cosx cosy +sinx siny
》cos45×cos30+sin 45× sin30
》1/root2×root3/2+1/root2×1/2
》root3/2root2+1/2root2
》root3+1/2root2
I hope this is helpful if so mark as brainliest answer plzzz
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