if sina = 1/2 then find the value of 3sina – 4sin³a​

Question

if sina = 1/2 then find the value of 3sina – 4sin³a​

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Ella 1 month 2021-08-16T12:47:01+00:00 2 Answers 0 views 0

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    0
    2021-08-16T12:48:26+00:00

    Answer:

    what’s the question?????

    0
    2021-08-16T12:48:35+00:00

    Answer:

    1

    Step-by-step explanation:

    3sinA-4sin³A=sin3A

    Since SinA= 1/2

    Hence, A = 30°

    Now sin3A = 3sinA – 4sin³A

                       = sin3(30°)

                       =sin90°

    = 1.

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