If sin theta=21/29 ,what is cos theta

2 answers:

6 0

To find cosine, you can use one of the formulas in the Pythagorean Identity, which is Sin^2 + Cos^2 = 1. Using this information, we can plug in sin into this equation.

So, (21/29)^2 + cos^2 = 1

(21/29)^2 = 441/841.
Bring this over to the other side by subtracting it by both sides, so

cos^2 = 1 - 441/841.
To subtract, convert the one to have the same denominator and then subtract, so

cos^2 = 841/841 - 441/841 = cos^2 = 400/841 (square root this)

cos = 20/29 that is your final answer.

vladimir2022 [97]4 years ago

5 0

20/29 is the cosine of theta

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Pls help! I'm confused. Can you explain this if you can.

alexdok [17]

Answer:

From a table, for an ordered pair (0, y), y will not be zero. From a graph, the y-intercept will not be zero. From an equation, it will have the form, y = mx + b where b is ≠ 0.

Step-by-step explanation:

From a table, for an ordered pair (0, y), y will not be zero. If there is not a constant rate of change in the data displayed in a table, then the table represents a nonlinear nonproportional relationship.
From a graph, the y-intercept will not be zero. This means that it doesn't contain or go through the origin.
From an equation, it will have the form, y = mx + b where b is ≠ 0. (not equal to zero). If an equation is not a linear equation, it represents a nonproportional relationship. A linear equation of the form y = mx + b may represent either a proportional (b = 0) or nonproportional (b ≠ 0) relationship. Therefore, when b ≠ 0, the relationship between x and y is nonproportional.