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[" 19.Solve."],[qquad [" What is "sin^(2...

[" 19.Solve."],[qquad [" What is "sin^(2)66(1^(@))/(2)-sin^(2)23(1)/(2)" equal to? "],[o.,sin47^(@)],[o.cos47^(@)],[0],[2sin47^(@)],[2cos47^(@)]]

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sin47^(@)+cos77^(@)=cos17^(@)

Prove that sin^(2)47^(@)+sin^(2)43^(@)=1

Find the value of (sin43^(@))/(cos47^(@)) .

The value of (sin43^(@)cos47^(@)+cos43^(@)sin47^(@)) is

sin47^(@)+sin61^(@)-sin11^(@)-sin25^(@)=

sin47^(@)+sin61^(@)-sin11^(@)-sin25^(@)=

Show that sin47^(@)+sin61^(@)-sin11^(@)-sin25^(@)=cos7^(@)

(a) Prove that sin65^(@)+cos65^(@)=sqrt(2)cos 20^(@) (b) Prove that sin47^(@)+cos77^(@)=cos17^(@)

(a) Prove that sin65^(@)+cos65^(@)=sqrt(2)cos 20^(@) (b) Prove that sin47^(@)+cos77^(@)=cos17^(@)

(a) Prove that sin65^(@)+cos65^(@)=sqrt(2)cos 20^(@) (b) Prove that sin47^(@)+cos77^(@)=cos17^(@)