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(pi/5)cos((2pi)/(15))-sin(pi/5)sin((2pi)/(15)) ?
The value of cos(pi/5)cos((2pi)/(15))-sin(pi/5)sin((2pi)/(15)) is 1/2