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Kruka [31]
3 years ago
6

sin%28%20%5Calpha%20%29%20" id="TexFormula1" title=" \cos( \alpha + \frac{\pi}{2} ) = - \sin( \alpha ) " alt=" \cos( \alpha + \frac{\pi}{2} ) = - \sin( \alpha ) " align="absmiddle" class="latex-formula">
why is it equal​
Mathematics
1 answer:
alexandr1967 [171]3 years ago
5 0

\cos (\alpha +\frac{\pi}{2})= \cos(\frac{\pi}{2})\cos (\alpha)- \sin(\frac{\pi}{2})\sin(\alpha)\\=0-\sin(\alpha)\\=-\sin (\alpha)

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Determine if the expression 9x^-2 is a polynomial or not. If it is a polynomial, state
Andrej [43]

Answer:

9x⁻²  is not a polynomial

Step-by-step explanation:

A polynomial function is a function that involves non-negative integer powers of x such as a quadratic, cubic etc.

A polynomial is a function written in the form of ;

f{x} =aₙxⁿ+aₙ₋₁xⁿ⁻¹+-------+a₂x²+a₁x+a₀

The degree of a polynomial is the highest power of x in the expression

9x⁻² ----in this case, the power is negative thus this is not a polynomial.

5 0
2 years ago
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Mr.Brown is creating examples of systems of equations. He completes the steps to find the solution of the equation below. Based
julia-pushkina [17]

Answer:

infinitely many solutions

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0 = 0 ← is a true statement.

Indicates that the 2 lines are the same line, that is one lying on top of the other.

Thus the system has an infinite number of solutions

4 0
3 years ago
Your averages and values are the following:
ioda

Answer: You need a grade of 78 on the final exam to earn a final grade average of at least 87 in each grading system.

Step-by-step explanation:

(85 + 90 + 95 + x)÷ 4 =87

Simplify:

(270 + x) ÷ 4 = 87

Rearrange:

(x + 270) ÷ 4 = 87

Multiply terms to Reduce:

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Cancel Multiplied terms in Denominator:

x + 270 = 4 * 87

Multiply:

x + 270 = 348

Subtract 270 on both sides of the equation:

x + 270 - 270 = 348 - 270

Simplify:

x = 78

6 0
2 years ago
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Im sorry if this is late but the answer is 34x2. goodluck :D
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andriy [413]
2.25 feet. 11.75 - 9.5 = 2.25.
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3 years ago
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