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DeGeneral770
20.09.2020 •
Mathematics
Which expression is equal to –1? cot StartFraction pi Over 4 EndFraction sin StartFraction pi over 2 EndFraction sin StartFraction 3 pi Over 2 EndFraction tan StartFraction 5 pi Over 4 EndFraction
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Ответ:
Given:
The four expression in the options.
To find:
Which expression is equal to –1.
Solution:
In option A,
In option B,
In option C,
In option D,
Therefore, the correct option is C.
Ответ:
t = 120[6/4] = 180 ft (tower's height)