Question
If cos4 p - sin4 p =
src="https://static.ixambee.com/public/images/quesimg/Question Bank/Quantitative Aptitude/Trigonometry/86670_5335457.gif" alt="" /> , then the value of 2 cos2 p - 1 isSolution
cos4 p - sin4 p = 
(cos2 p + sin2 p)(cos2 p - sin2 p) = (cos2 p - sin2 p) = cos2 p - (1-cos2 p) = 2 cos2 p-1 =
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