The formula is sin sq A + cos sq A = 1 but then can v write sin sq A- cos sq A=-1?
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NO we can't
sin sq A+cos sq A=1
if we take negative on both side then it becomes
-sin sq A-cos sqA=-1
and sin sqA-cos sqA=
-cos2A
sin sq A+cos sq A=1
if we take negative on both side then it becomes
-sin sq A-cos sqA=-1
and sin sqA-cos sqA=
-cos2A
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