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Math Help - Some Trig problems need checking

  1. #1
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    Some Trig problems need checking

    Hi

    here they are, please help me check to see if they're right. thank you
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  2. #2
    Super Member angel.white's Avatar
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    Yes, those are correct. On 2.b, you may wish to add a label stating "substitution" where you used it. It is easy enough to follow, but you jump into it with no declaration, your instructor might not like this.
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  3. #3
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    thanks for the reply.

    yeah on 2.b, I kinda cut off my substitution of x=tan(ct) (left margin) when I scanned it so it should be fine.

    Haha, I found a bubu on my 2.a this morning while in class. I forgot to carry down the 2 (should be 2cos+1 instead of cos+1), but all's well. I fixed it in the last sec.
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