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Math Help - Help with 2 problems

  1. #1
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    Help with 2 problems

    I am stuck on these 2 problems. Any help would be appriciated. Please show me the steps so that I can see where I am missing it.
    Find the exact value:
    sin[arcsin 1/3 + arcsin(-2/5)]

    second problem: verify as an identity:
    2tanx secx cscx = 2+2tan^2x

    Thanx for the help and just maybe I can help someone else someday.
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  2. #2
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    skeeter's Avatar
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    here's a hint for the first problem ...

    \sin(a+b) = \sin{a}\cos{b} + \cos{a}\sin{b}


    second problem ...

    the left side will simplify to \frac{2}{\cos^2{x}} ...

    then use the Pythagorean identity \sec^2{x} = 1 + \tan^2{x}
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  3. #3
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    Thanx for the help. I knew it was pretty cut and dried but I could not see it. Thanx
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