trigo

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how do i verify these?

1-sin^2B
1. ----------- = csc^2B-sec^2B
sin^2Bcos^B

2. cos(2a+a) = 4cos^3a-3cosa

  • trigo -

    1. What exponent goes between ^ and cos? If it is 2, I do not believe the identity is valid as written.

    What IS valid is

    1/sin^2 B - sin^2B/(sin^2B cos^2 B) =
    csc^2 B - sec^2 B

    or

    [cos^2 B - sin^2 B]/[sin^2B cos^2B ] =
    csc^2 B - sec^2 B

  • trigo -

    1. (1-sin²B)/(sin²Bcos²B)= csc²B-sec²B

    --that's really the given. please help.

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