2cos²60+ 3sin²45 - 3 sin²60+ 2cos²90
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Step-by-step explanation:
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Answer:
cos²60 = 1/4
sin²45 = 1/2
sin²60 = 3/4
cos²90 = 0
∴ 2cos²60+ 3sin²45 - 3 sin²60+ 2cos²90 = 2/4 + 3/2 - 1/4 + 0
= 1/2 + 3/2 -1/4
= 2 - 1/4
= 7/4
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