若sin(π/4+Q)=3/5(0
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若sin(π/4+Q)=3/5(0若sin(π/4+Q)=3/5(0若sin(π/4+Q)=3/5(0sin(π/4+Q)=3/50π/4∴cos(π/4+Q)=4/5cos2Q=sin(π/2+2Q
若sin(π/4+Q)=3/5(0
若sin(π/4+Q)=3/5(0
若sin(π/4+Q)=3/5(0
sin(π/4+Q)=3/5
0
∴cos(π/4+Q)=4/5
cos2Q
=sin(π/2+2Q)
=sin[2(π/4+Q)]
=2sin(π/4+Q)cos(π/4+Q)
=2×3/5×4/5
=24/25
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由sin(π/4+Q)=3/5 cos(π/4+Q)=4/5 (0
Q在四分之拍到二分之拍之间，无解。