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sunnymony

how sin2a +cos2a =1

  • one year ago
  • one year ago

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  1. hubertH
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    what is the question must u prove that the RHS=LHS?

    • one year ago
  2. sunnymony
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    prove that this question?

    • one year ago
  3. scarydoor
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    you mean sin^2 a + cos^2 a = 1.

    • one year ago
  4. scarydoor
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    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.

    • one year ago
  5. scarydoor
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    |dw:1353754710511:dw|

    • one year ago
  6. asnaseer
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    you can actually prove it on any right-angled triangle by drawing it as follows: |dw:1353754910236:dw|

    • one year ago
  7. asnaseer
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    then use definition of sin(theta) and cos(theta) and pythagorus to prove it

    • one year ago
  8. sunnymony
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    ok

    • one year ago
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