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Vadim26 [7]
3 years ago
12

: Đẳng thức nào sau đây đúng ? A. cos4x – sin4x = 2-cos2x B. cos4x – sin4x = 1+2sin2x

Mathematics
1 answer:
Mazyrski [523]3 years ago
3 0

Step-by-step explanation:

A. cos4x-sin4x=2-cos2x

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if n is the largest two digit nuber that can be expressed as the product of two prime numbers greater than 3, what is the value
sasho [114]

List of the first few prime numbers greater than 3:

5, 7, 11, 13, 17, 19, 23, 29

Now find the combination that you can multiply and still have a 2 digit number:

5 x 7 = 35

5 x 11 = 55

5 x 13 = 65

5 x 17 = 85

5 x 19 = 95

5 x 23 = 115 ( 3 digit number, can't use).

7 x 5 = 35

7 x 11 = 77

7 x 13 = 91

7 x 19 = 133 ( 3 digit number, can't use).

The largest 2 digit number would be 5 x 19 = 95

6 0
3 years ago
4x+5y=20 need help solving x and y intercept plotting
Mrrafil [7]

Answer:

(Hope this helps can I pls have brainlist (crown)☺️)

Step-by-step explanation:

To find the x-intercept, substitute in  0  for  y  and solve for  x To find the y-intercept, substitute in  0 for  x and solve for  y.

Slope: m=-\frac{4}{5}

x-intercept(s):  ( 5 , 0 )

y-intercept(s):  ( 0 , 4 )

8 0
2 years ago
Direction if parabola. x2?6x+8=yx2-6x+8=y
STatiana [176]

{\text{Direction of parabola depends on the sign of quadratic coefficient of a }} \hfill \\

{\text{quadratic equation}}. \hfill \\

{\text{For given quadratic equation}}. \hfill \\

a{x^2} + bx + c = 0 \hfill \\

{\text{The parabola is in the upward direction if }}a{\text{ }} > {\text{ }}0{\text{ and in downward direction if }}a < 0 \hfill \\

{\text{Here, the equation of given parabola is }} \hfill \\

{x^2} - 6x + 8 = y \hfill \\

\Rightarrow y = \left( {{x^2} - 6x + 9} \right) - 9 + 8 \hfill \\

\Rightarrow y = {\left( {x - 3} \right)^2} - 1. \hfill \\

{\text{Thus, the parabola is in the upward direction}} \hfill \\

8 0
3 years ago
What is 8.07 × 102 in standard form
SOVA2 [1]

Answer:

8070

Step-by-step explanation:

Given:  

8.07

x

10

3

8.07

×

10

3

=

8.07

×

1000

=

8070

7 0
2 years ago
Does 4/7 and 24/35 form a proportion?
nignag [31]
Well 24=4*6, and 35=7*5 not 6, so 4/7 doesn't = 24/35, so no
6 0
3 years ago
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