Mathematics: B) (1 - cos B)(1 + cos B) = 1/cosec^2(B)

B) (1 - cos B)(1 + cos B) = 1/cosec^2(B) - id111210084896, zoeybuch5

Ответ:

vliu732

14.02.2022

Proved

Step-by-step explanation:

$(1-cosB)(1+cosB)=\frac{1}{cosec^2B} \\\\Use\\\\ (a+b)(a-b)=a^2-b^2 ,\\so,\\=(1)^2-(cosB)^2\\=1-cos^2B\\\\Now\ , we\ know\ \\sin^2B+cos^2B=1\\\\so,\\sin^2B=1-cos^2B\\so we just replace,\\\\=1-cos^2B=sin^2B\\and\ since\ sinB=\frac{1}{cosecB} \\\\=sin^2B=\frac{1}{cosec^2B}\\$

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Ответ:

austintules2005

24.03.2023

Mathematics

-4x = -3

3 = 4x

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B) (1 - cos B)(1 + cos B) =
1/cosec^2(B)

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