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" Q."4." Evaluate the determinant "|[sin...

" Q."4." Evaluate the determinant "|[sin70^(@),-cos70^(@)],[sin20^(@),cos20^(@)]|

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cos70^(@)+sin40^(@)=

cos70^(@)+sin40^(@)=

|["cos"70^(@), "sin"20^(@)], ["sin"70^(@), "cos"20^(@)]|=?

cos 70^(@) + sin 40^(@)=

sin 70^@ - cos 40^(@) =

(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))

sec70^(@)sin20^(@)+cos20^(@)cosec70^(@)=2

(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))=

(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))=

sec70^(@)sin20^(@)+cos20^(@)"cosec"70^(@)=?