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Juliette [100K]
3 years ago
15

(1+sin y)(1+sin (-y))=cos^2 y)

Mathematics
2 answers:
Goryan [66]3 years ago
5 0
Sin (-x) = - sin x
sin^2+cos^2=1

(1+siny)(1-siny)=cos^2y 
1-sin^2=cos^2y
cos^y=cos^2



Sloan [31]3 years ago
4 0
(1+siny)(1+sin(-y))=cos^2y\\\\L=(1+siny)(1-siny)=1^2-sin^2y=1-sin^2y=cos^2y\\\\R=cos^2y\\\\L=R


sin(-x)=-sinx\\\\sin^2x+cos^2x=1\to1-sin^2x=cos^2x\\\\(a+b)(a-b)=a^2-b^2
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Answer:

0.6 is the required probability.

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 250

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We have to evaluate the probability that a person in this sample accesses the internet at home or at work.

P(H\cup W) = P(H) + P(W) - P(W\cap H)\\P(W\cup H) = 0.37 + 0.44-0.21\\P(H\cup W)  = 0.6

Thus, 0.6 is the probability that a person in this sample accesses the internet at home or at work

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8-(6r+2)

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