SOLUTION: Use the sum/difference identities to simplify the
expression. Do not use a calculator.
{{{cos (7pi/18) cos (2pi/9) + sin (7pi/18) sin (2pi/9) }}}
Answer : {{{ cos (pi/6) }
Algebra.Com
Question 932383: Use the sum/difference identities to simplify the
expression. Do not use a calculator.
Answer :
Could you explain the steps to get to the answer? Thank you
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
(one of the many trig identities)
Plug in and
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