What is csc ( θ 2 ) in terms of trigonometric functions of a unit θ ?

Question

What is             csc              (                  θ          2                )             in terms of trigonometric functions of a unit       θ  ?

Edwin Simmons · Accepted Answer

Recall             cos      2        A    =    1    -    2                  sin        2            A      i.e.       2                  sin        2            A        =    1    -          cos      2        A  or                     sin        2            A        =                  1        -                  cos          2                A            2      or             sin      A        =                                        1            -                          cos              2                        A                    2                    Putting       2    A    =    θ   or       A    =          θ      2      Therefore,             sin              (                  θ          2                )              =                                        1            -                          cos              θ                                2                    or             csc              (                  θ          2                )              =                            2                      1            -                          cos              θ

What is csc ( θ 2 ) in terms of trigonometric functions of a unit...

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