Solution
Solution
+1
Solution steps
Use the following trivial identity
Rewrite using trig identities
Use the following trivial identity
Rewrite using trig identities
Simplify
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Frequently Asked Questions (FAQ)
What is the value of cos(pi/3)cos(pi/5)+sin(pi/3)sin(pi/5) ?
The value of cos(pi/3)cos(pi/5)+sin(pi/3)sin(pi/5) is (sqrt(5)+1+sqrt(6)sqrt(5-\sqrt{5)})/8