Lawrence101
09.05.2021 •
Social Studies
If Sin A+ Sin B = x and cos A+cos B = y prove that tan (a-b/2)
= +-√ 4x² - y2/
x² + y2 and tan (a+b/2) =
Y
2
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Ответ:
The answer is D The United States and the Soviet Union
Explanation: