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find exact value cos(13pi/15)cos(-pi/5)-sin(13pi/15)sin(-pi/5)

find exact value cos(13pi/15)cos(-pi/5)-sin(13pi/15)sin(-pi/5)
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2. asked by chris
3. 1,189 views
Find the linear approximation L(x)of the function f(x)=cos(pi/(6)x) at the point x=1 and use it to estimate the value of
1. 1 answer
2. asked by Amy
3. 685 views
How do you find the exact value of Sin(13pi)?
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2. asked by George
3. 2,048 views
Find the exact value of Sin^-1(sin(13pi/15))
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2. asked by Kelly
3. 952 views
Find exact value of cos(13pi/6)
1. 1 answer
2. 66 views
Given that cos 13pi/18=sin y, first express 13pi/18 as a sum of pi/2 and an angle, and then apply a trigonometric identitiy to
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2. asked by Vincent
3. 1,810 views
Given that cos 13pi/18=sin y, first express 13pi/18 as a sum of pi/2 and an angle, and then apply a trigonometric identitiy to
1. 3 answers
2. asked by uwu
3. 849 views
use a sum or difference formula to find the exact of the trigonometric functioncos(-13pi/12)
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2. asked by lina
3. 867 views
Find the exact value of the following trigonometric functions:sin(13pi), cos(14pi), tan(15pi)
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2. asked by Greg
3. 911 views
Please help!Find the point where the curve r(t) = (12sint)i -(12cost)j +5k is at a distance 13pi units along the curve from the
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2. asked by Chris
3. 786 views