show that sin^4theta-cos^4theta=1-cos^2thera
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sin^4theta-cos^4theta>>>>>>(sin^2theta+cos^2theta)(sin^2theta-cos^2theta)...
1-(-cos2theta)....
1+cos2theta
1-(-cos2theta)....
1+cos2theta
pradnya102:
sin^2theta-cos^2theta=?
you erite above ans as -cos^2theta then where ie sin^2theta
ok
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Look once.. If any correction pls let me know
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