heyyyyy39
18.03.2020 •
Mathematics
Hi:) anyone able to help with 4(a) ? question in the pic attached :) thanks!
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Ответ:
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Work Shown:
This is in the form with a = 2 and b = -1
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note: for this line, I expanded each pair of multiplying binomials. In the numerator, I used the box method as shown in the diagram below. Each inner cell is the result of multiplying the corresponding outer cell expressions. Example: for row2, column1, we have . The other cells are filled out in a similar fashion. In the denominator, I used the difference of squares rule.
Ответ:
sin x ( sin x + cos x ) = 0
sin x = 0 ; x 1 = k π ; k ∈ Z
sin x + cos x = 0 / ²
sin² x + 2 sin x cos x + cos² x = 0
2 sin x cos x + 1 =0
sin ( 2 x ) = - 1
x = 3π / 2 + 2 kπ / : 2
x 2 = 3π / 4 + kπ ; k ∈ Z