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Question
Evaluate:
cos450 cos300 + sin450 sin300
Solution
On substituting the values of various T-ratios, we get:
cos450 cos300 + sin450 sin300
`=(1/sqrt(2) xxsqrt(3)/2 +1/sqrt(2) xx1/2) = (sqrt(3)/(2sqrt(2)) + 1/(2sqrt(2)) )= ((sqrt(3)+1)/(2sqrt(2)))`
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