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Linear Algebra
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OpenStudy (anonymous):
how sin^2(2x) + cos^2(2x) = 1 ?
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OpenStudy (dls):
Try evaluating at any angle,30,45,60,90.
OpenStudy (aravindg):
Its an identity. sin^2 x+cos^2 x=1 x can be anything.
OpenStudy (anonymous):
sorry i asked sin^2(2x) not sin^2x .
OpenStudy (aravindg):
Its an identity means it holds for x,2x,3x or anything!
OpenStudy (akashdeepdeb):
Exactly! 2x is the angle and it does not matter what value it is ! The identity is valid for ALL ANGLES Provided: sin and cosine have got the same angles!! :D
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OpenStudy (anonymous):
thank you both : )
OpenStudy (akashdeepdeb):
:)
OpenStudy (aravindg):
yw :) and Welcome to Openstudy!
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