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gabyzermeno16
20.11.2020 •
Mathematics
Select the correct answer.
Which inequality will have a dashed boundary line with a shaded area above its graph?
OA. 7x- ys3
OB. x- ys 4
OC. 2x-9y> 2
OD.
4x + 7y> 3
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Ответ:
LHS:
Expand the fractions using (a+b+c)²=a²+b²+c²+2ab+2bc+2ca.
Rearrange the terms.
We know that cos²A+sin²A=1.
Now here, take -2cos common from the numerator and +2cos common from the denominator.
Now, rearrange the terms, add 1 and 1 and take 2 common.
Take 2 common.
Take (1+sin) common.
LHS=RHS.
HENCE PROVED!
FUNDAMENTAL TRIGONOMETRIC RATIOS:
T-RATIOS:
Ответ: