sin x = 1/3 and sec y = 5/4,
所以
cosx=2√2/3
cosy=4/5
siny=3/5
所以
sin(x+y)=sinxcosy+cosxsiny
=1/3*4/5+2√2/3*3/5
=(4+6√2)/15
If sin x = 1/3 and sec y = 5/4,where x and y lie between 0 a
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