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graph transformations

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    f(x) ≡ a + b sin x° + c cos x°, x ∈ , 0 ≤ x ≤ 360,
    The curve has turning points with coordinates (60, 5) and (240, 1) as shown.

    a) State, with a reason, the value of the constant a.

    b) Find the values of k and α, where k > 0 and 0 < α < 90, such that
    f(x) = a + k sin (x + α)°.

    c) Hence, or otherwise, find the exact values of the constants b and c.

    I am clueless on all of them.

    a) First i assumed the that a =4 because of translation up by 4. usually sin/cos curves have a max of 1.

    b) i used the minimum points and maximum points to construct two simultaneous equations:
    and minused leaving me with:

    ksin(60+α)-ksin(240-α) =4

    c) can't do this if i can't do a) or b).


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