23-06-2017
Mathematics

contestada

Which expression is equivalent to
(sin x + 1)(sin x − 1)?
A.)cos^2x
B.)-cos^2x
C.)cos^2x+ 1
D.)cos^2x − 1
E.)-cos^2x + 1

Respuesta :

schvelle schvelle

23-06-2017

B.
sin^2x + cos^2x =1
hence Sin^2x-1 = - cos^2x

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Tharindu Tharindu

23-06-2017

sin^2x -1 = -cos^2x.......

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