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prove that sin1(35)sin1(817)=cos1(8485)
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Solution:

Letsin1(35)=A

sinA=35

cos2A=1sin2A

=1925

=1625

cosA=45

sin1(817)=BsinB=817cos2B=1sin2B=164289=225289cosB=1517cos(AB)=cosAcosB+sinAsinB=45×1517+35×817cos(AB)=8485AB=cos1(8485)sin1(35)sin1(817)=cos1(8485)

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