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Cos(-155) = cos(155) = 1 - cos(180-155) = 1-cos(25).

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Q: Express cos -155 as a function of a positive acute angle?
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Related questions

Express the function tan 120 degree as function of an acute angle?

- tan 60


Express the function 120 degree as function of an acute angle?

Example: Express sin 120⁰ as a function of an acute angle (an angle between 0⁰ and 90⁰).Solution:Each angle θ whose terminal side lies in quadrant II, III, or IV has associated with it an angle called the reference angle, alpha (alpha is formed by the x-axis and the terminal side).Since 120⁰ lies on the second quadrant, then alpha = 180⁰ - 120⁰ = 60⁰.Since sine is positive in the second quadrant, sin 120⁰ = sin 60⁰.Example: Express tan 320⁰ as a function of an acute angle.Solution:Since 320⁰ lies on the fourth quadrant, then alpha = 360⁰ - 320⁰ = 40⁰.Since tangent is negative in the fourth quadrant, tan 320⁰ = -tan 40⁰.


What are the trigonometric function of an acute angle?

The trigonometric functions are sine, cosine and tangent along with their reciprocals and the inverses. Whether the angle is acute or obtuse (or reflex) makes no difference).


How many acute angles does a acute angle have?

1 acute angle = 1 acute angle


Sentence with acute?

That is an acute angle. An obtuse angle is not acute.


What is cos of a negative angle?

The cosine function is an even function which means that cos(-x) = cos(x). So, if cos of an angle is positive, then the cos of the negative of that angle is positive and if cos of an angle is negative, then the cos of the negative of that angle is negaitive.


What is a 17 degree angle?

An acute angle


What angle is smaller than a right angle?

acute angle


Does an acute has 17 degrees?

An acute angle is an angle less than 90°. So an angle of 17° is an acute angle.


How many angles does a acute angle have?

An acute angle has one angle.


What type of angle is 35 degrees?

This is an acute angle.


Which is larger an acute acute or an obtuse angle?

Acute angle = <90 degrees Right angle = 90 degrees Obtuse angle = >90 degrees To answer your question, obtuse angle is larger.