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**./3_8trig.tex
(3_8trig.tex
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[]$\teni sin\tenrm (\teni u\tenrm ) \tensy ^^@ \teni sin\tenrm (\teni v\tenrm )
 = \teni sin\tenrm (\teni u\tenrm ) + \teni sin\tenrm (\tensy ^^@\teni v\tenrm 
) = 2\teni sin\tenrm ([])\teni cos\tenrm ([])$ |

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Output written on 3_8trig.pdf (8 pages).