Question: = * a(18) .18 -aa 15-15 + 1BOYS 4 2. Find cos #. (Hint: We have not done the hal formulas. So can you use

 = * a(18) .18 -aa 15-15 + 1BOYS 4 2. Find

cos #. (Hint: We have not done the hal formulas. So can

= * a(18) .18 -aa 15-15 + 1BOYS 4 2. Find cos #. (Hint: We have not done the hal formulas. So can you use another formula you know?) upME

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