The figure shows the graph of y = sin x - k cos x(a) Find the value of k.(b) Solve 2k cos x + 1 = 2 sin x for 0° ≤ x ≤ 360°

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The figure shows the graph of y = sin x - k cos x(a) Find the value of k.(b) Solve 2k cos x + 1 = 2 sin x for 0° ≤ x ≤ 360°

The figure shows the graph of y = sin x - k cos x(a) Find the value of k.(b) Solve 2k cos x + 1 = 2 sin x for 0° ≤ x ≤ 360°
The figure shows the graph of y = sin x - k cos x
(a) Find the value of k.
(b) Solve 2k cos x + 1 = 2 sin x for 0° ≤ x ≤ 360°

The figure shows the graph of y = sin x - k cos x(a) Find the value of k.(b) Solve 2k cos x + 1 = 2 sin x for 0° ≤ x ≤ 360°
一定要用英语回答吗?希望你看的懂中文.
(a)如图,当x=0时,y=2,
所以2=sin0-kcos0,
so,k=-2
(b)2k cos x + 1 = 2 sin x,则2 sin x-2k cos x = 1
y = sin x - k cos x=1/2*2(sin x - k cos x)=1/2
即求当y=1/2时x的对应值,大约应该是105度吧.

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