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[" (a) "sin^(2)B-1quad vv" b) "2cos^(2)B-1quad " (c) "sin2Bquad " (d) "quad cos2],[(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))=?],[[" (a) "sqrt(2)," (b) "sqrt(3)," (c) "(1)/(sqrt(3))," (d) "(1)/(sqrt(2))]]

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

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

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

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

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

The value of (cos^3 20^@-cos^3 70^@)/(sin^3 70^@-sin^3 20^@) is (a) 1/2 (b) 1/(sqrt(2)) (c) 1 (d) 2

If : sin 40^(@)-cos 70^(@)= k * cos 80^(@), "then" : k = A) sqrt1 B) sqrt2 C) sqrt3 D) sqrt4

sin^(2) A cos^(2)B + cos ^(2) A sin^(2) B + sin^(2) A sin^(2) B+ cos^(2) A cos^(2) B=

sin^(2)A cos^(2)B-cos^(2)A sin^(2)B=sin^(2)A-sin^(2)B