1 asked in Education & ReferenceHomework Help · 9 years ago

sin....cosine.....very short!!! please open!!?

Prove each identity: ( btw: this lesson is about sin, cosin, tan...etc)

sin x + sin x cot^2 x = csc x all the x's are letters not 'times'

my answer: csc x

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  • Ed I
    Lv 7
    9 years ago
    Favorite Answer

    LHS: sin x + sin x cot^2 x = sin x + sin x • cos^2 x/sin^2 x = sin x + cos^2 x/sin x = (sin^2 x + cos^2 x)/sin x = 1/sin x = csc x

  • Anonymous
    9 years ago

    what you have as your answer is not what the problem is looking for.

    the problem is asking you to show your work on PROVING that: sinx + (sinx)(cot^2x) = cscx

    to do this, just look at the list of trigonometric identities which you can find on the web OR your MATH TEXT BOOK.

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