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On the unit circle sin(90) degrees is at Y = 1 and as that is on the Y axis X will equal = 0.

Ask yourself. Where would 90 degrees be on a 360 degree circle? Straight up.

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Q: Why does x equal 0 when finding the sin of 90 degrees?
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What is the sin of 90 degrees?

sin(90) = 1


Cosine 35 degrees sine 55 degrees plus sine 35 degrees cosine 55 degreees?

cos(35)sin(55)+sin(35)cos(55) If we rewrite this switching the first and second terms we get: sin(35)cos(55)+cos(35)sin(55) which is a more common form of the sin sum and difference formulas. Thus this is equal to sin(90) and sin(90)=1


Does a central anglehave to equal 90 degrees?

a central angle does NOT have to equal 90 degrees


Determine the measure of angle A if 0 degrees is smaller than or equal to A which is smaller than or equal to 90 degrees and cos125 degrees equals negative cos A?

cos(125) = cos(180 - 55) = cos(180)*cos(55) + sin(180)*sin(55) = -cos(55) since cos(180) = -1, and sin(180) = 0 So A = 55 degrees.


What are two angles that equal 90 degrees?

Two angles that are equal to 90 degrees are Complimentary.


What angles combine to equal 90 degrees?

Angles combining to equal 90 degrees are known as complementary angles.


Do supplementary angles equal 90 degrees?

No because they equal 180 degrees


4 sides equal angles not 90 degrees?

If all 4 sides are equal and the angles are not 90 degrees it is a rhombus.


What Celsius temperature is equal to 90 degrees Fahrenheit?

90 degrees Fahrenheit = 32.2 degrees Celsius.


How many degrees Celsius is equal to 90 degrees Fahrenheit?

90 degrees Fahrenheit is 32.2 (repeating) degrees Celsius.


What is tan of 90 degrees?

On the unit circle at 90 degrees the 90 degrees in radians is pi/2 and the coordinates for this are: (0,1). The tan function = sin/cos. In the coordinate system x is cos and y is sin. Therefore (0,1) ; cos=0, & sin=1 . Tan=sin/cos so tan of 90 degrees = 1/0. The answer of tan(90) = undefined. There can not be a 0 in the denominator, because you can't devide by something with no quantity. Something with no quantity is 0. Or, on a limits point of view, it would be infinity.


What is 90 Celsius equal in Fahrenheit?

The temperature 90 degrees Celsius is equal to 194 degrees Fahrenheit. Which is to say very hot.