4×43+3×31−8×21
![4sin {}^{2} 60+3tan {}^{2} 30−8sin45.cos45\ \textless \ br /\ \textgreater \ \ \textless \ br /\ \textgreater \](https://tex.z-dn.net/?f=4sin+%7B%7D%5E%7B2%7D+60%2B3tan+%7B%7D%5E%7B2%7D+30%E2%88%928sin45.cos45%5C++%5Ctextless+%5C+br+%2F%5C++%5Ctextgreater+%5C+%5C++%5Ctextless+%5C+br+%2F%5C++%5Ctextgreater+%5C+ "4sin {}^{2} 60+3tan {}^{2} 30−8sin45.cos45\ \textless \ br /\ \textgreater \ \ \textless \ br /\ \textgreater \")
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Answered by
80
Step-by-step explanation:
Given
4sin²60° + 3tan²30° - 8sin45° . cos45°
4 . ( √3 / 2 )² + 3 ( 1 /√3 )² - 8 ( 1 /√2 ) . ( 1 /√2 )
= 4 × 3 / 4 + 3 × 1 / 3 - 8 × 1 / 2
= 3 + 1 - 4
= 3 - 3
= 0
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