Solution
Solution
+1
Solution steps
Rewrite using trig identities
Use the following trivial identity
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Frequently Asked Questions (FAQ)
What is the value of cos((11pi)/(20))cos(pi/5)-sin((11pi)/(20))sin(pi/5) ?
The value of cos((11pi)/(20))cos(pi/5)-sin((11pi)/(20))sin(pi/5) is -(sqrt(2))/2