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Verified answer
Cos² a -2cos a sin a+ sin²a= 1-2cos a sin a
.. Ingat sin²x+cos²= 1
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Verified answer
(cos a - sin a)²= (cos a - sin a)(cos a - sin a)
= cos² a - sin a . cos a - sin a . cos a + sin² a
= (cos²a + sin²a) - 2(sin a )(cos a)
= 1 - sin 2a