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[" सिद्ध कीजिए कि : "],[" 13."sin70^(@)*...

[" सिद्ध कीजिए कि : "],[" 13."sin70^(@)*sec20^(@)=1]

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sin20^(@)(4+sec20^(@))=

sin 20^(@) (4 + sec 20^(@)) =

1 + sec20 =

Find A if sin20^(@)tanAsec70^(@)=sqrt(3)

Find the value of "cosec"70^(@)-sec20^(@)

सिद्ध कीजिए कि |vecA xx vecB|^(2) + |vecA * vecB|^(2) = (AB)^(2).

सिद्ध कीजिए कि 2tan^(-1)sqrt((b)/(a))=cos^(-1)((a-b)/(a+b))

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