Evaluate (sin tita + cos tita) square +(sin tita - cos tita) square
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(sin tita-cos tita)^+(sin tita-cos tita)^
By using the formula
(a+b)^-(a-b)^=a^-b^
sin ^tita-cos ^tita
By using sin^tita+cos^tita=1
cos^tita=1-sin^tita
Applying this formula to
sin^tita-cos^tita
sin^tita-1-sin^tita
+sin^tita-sin^tita cancel
answer is -1
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