**Find the exact value of cos 8*cos 38 + sin 8* sin 38 eNotes**

9/08/2018Â Â· To find the sine of an 80 degree angle, you will either need to key in sin 80 followed by the equal sign or enter key, or 80 sin. (The answer is -0.9939.) (The answer is -0.9939.) You can also type in "sine calculator" into a web search, and find a number of â€¦... By the product-to-sum formula 2cos AsinB = sin(A+B) âˆ’ sin(Aâˆ’B) with A=36 and B=18 , we get 2cos36 sin18 = sin54 âˆ’ sin18 , which combined with equation (1) gives

**Trigonometry Review Workshop 1**

9/08/2018Â Â· To find the sine of an 80 degree angle, you will either need to key in sin 80 followed by the equal sign or enter key, or 80 sin. (The answer is -0.9939.) (The answer is -0.9939.) You can also type in "sine calculator" into a web search, and find a number of â€¦... We will learn to find the exact value of cos 36 degrees using the formula of multiple angles. How to find exact value of cos 36Â°? Let A = 18Â° Therefore, 5A = 90Â°

**Find The Value Of Sin 300 Degrees? Math Discussion**

Here is a table of "exact" values of common values of sin and cos. I started with the standard values associated with the 30 60 90 triangle and the 45 45 90 triangle, and used the sum-of-sin, double angle and half angle identities to derive sines of other angles. Then I folded in Ptolemy's contribution, which is sin 36 .... Inverse sine calculator. Enter the sine value, select degrees (Â°) or radians (rad) and press the = button. Enter the sine value, select degrees (Â°) or radians (rad) and press the = button. RapidTables

**Mathway Find the Exact Value sin(105)**

C program to find the value of sin(x) Posted on September 30, 2011 June 22, 2017 by Sandeepa Nadahalli Write a C program to find the value of sin(x) using the series up to the given accuracy (without using user defined function) Also print sin(x) using library function.... 10/04/2010Â Â· how to find the value of sin 72 degree without using any table

## How To Find The Value Of Sin 36

### how to find the value of sin 72 degree? Yahoo Answers

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## How To Find The Value Of Sin 36

### Use Identities to find the exact value. cos 36Â° cos 24Â° - sin 36Â° sin 24Â°

- 25/02/2014Â Â· Best Answer: First we define a number Ï† = Â½ [(âˆš5)Â±1] = 1.618033989, 0.618033989 ; being the solutions of the equation Ï†Â² -Ï† -1 = 0. It gives two important results 1) Ï†+1 = Ï†Â², 2) Ï† -1 = 1/Ï† This can be used to solve Trigonometric functions involving multiples of 18Âº. From the standard formulae
- Inverse sine calculator. Enter the sine value, select degrees (Â°) or radians (rad) and press the = button. Enter the sine value, select degrees (Â°) or radians (rad) and press the = button. RapidTables
- 12/06/2013Â Â· by using the ratios of double angles (so cos^2x - sin^2x and 2 sin x cos x) please help me find the exact value of these two degrees. Please show how you did it, I know what the answer is I need to know how to do it.
- how to find the exact value of sin 225. Looking at the unit circle sin(225) is in the third quadrant 225 - 180 = 45 sin(45) mapped to the third quadrant is

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