Posted by Brianna on Friday, November 4, 2011 at 12:10pm.
sin( 27pi/4 + 17pi/6)
= sin(1215° + 510°) --- sometimes I think better with degrees
= sin(1725°)
= sin(285°) ---- 1725 = 4*360 + 285
= - sin 75°
=- sin(45°+30°)
= - [sin45cos30 + cos45sin30]
= - [ (1/√2)(√3/2) + (1/√2)(1/2)]
= - (√3 + 1)/(2√2)
or after rationalizing ...
= -(√6 + √2)/4
Related Questions
trig - Find the exact value. Without using a calculator a) cos (-17pi/6) b) sec...
trig - find the exact value of the expression , sin-1(-0.5)
Trig - find the exact value of the expression using the provided information. ...
Trig - find the exact value of the expression using the provided information. ...
MATH - 1.)Find the exact solution algebriacally, if possible: (PLEASE SHOW ALL ...
trig/pre -calc - hello, i don't quite understand how to do this type of ...
Trig - Using a double angle formula how would you find the exact value of this ...
trig - find the exact value of sin(u+v) given that sin u=3/5 and sin v= 15/17
Trig - 1. Establish the identity: sin(theta+3pi/2)=-cos(theta) 2. Find the exact...
trig - suppose that sin(x) + cos(x) = 4/3 a)square this result and find a value ...
For Further Reading
