Question about Super Tutor Trigonometry (ESDTRIG) for PC

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What is the value of SIN15 degree and COS15 degree.....?

Please give the answer in detail.

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Hi rowanwah

The sine of an angle is only applicable is a right triangle. If you just want a number, ie, the actual value of the sine 15 degrees you can look it up on Google. Do a search for "sine and cosine functions"

If you want the mathematical description of the sine of an angle it is described as follows
In a triangle ABC, there are 3 angles angle A, angle B and angle C. There are also 3 sides, Side AB, Side AC and side BC. The sine of angle A is equal to the side opposite Angle A divided by the Hypotenuse (the longest side opposite the right angle)
The Cosine of angle A is equal to the side adjacent to Angle A divided by the hypotenuse

Hope this helps Loringh PS Please leave a rating for me Thanks

Posted on Nov 17, 2008

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Sin15 =sin(45-30) = sin45.cos30 - cos45.sin30
[ It is in the form of sin(A-B), so sin A. cosB - cosA. sinB]

  1. =1/1.414 .1.7321/2 - 1/1.414 .1/2
  2. =0.5175947
  3. so cos 15 is also same prosiger

Posted on Dec 05, 2008

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If it were not the case, the same integral will have two different values depending on the unit you use: and that cannot be.

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I have no idea where you got that particular value of a sin (41).
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I suspect you need the angle unit to be set to degrees. If you do you will find that sin (41 degrees)=0.656059029 which is close to the rounded up value you call the "right answer".

To set the angle unit to degrees
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Help


Simple 0.5(cos15 + (squer of 3).sin 15) =0.5(cos15+(3x3).Sin15) =0.5(0.9659+9x0.2588) =0.5(0.9659+2.3292) =0.5x3.2951 =1.64755 Zulfikar Ali ali_zulfikar@yahoo.com 989980221

Mar 09, 2009 | Super Tutor Trigonometry (ESDTRIG) for PC

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