anonymous
  • anonymous
how sin2a +cos2a =1
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
what is the question must u prove that the RHS=LHS?
anonymous
  • anonymous
prove that this question?
anonymous
  • anonymous
you mean sin^2 a + cos^2 a = 1.

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anonymous
  • anonymous
What I do is remember how sin and cos can be thought of as coming out of the unit sphere, with certain angles, and forming a right angle triangle from the angle, etc. Then you just have pythagoras' theorem.
anonymous
  • anonymous
|dw:1353754710511:dw|
asnaseer
  • asnaseer
you can actually prove it on any right-angled triangle by drawing it as follows: |dw:1353754910236:dw|
asnaseer
  • asnaseer
then use definition of sin(theta) and cos(theta) and pythagorus to prove it
anonymous
  • anonymous
ok

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