Hi, for part A of differentiation problem set, i don't understand problems 6B and 7B for 1A. 6B) asks to state "sinx-cosx" in "Asin (x+c)" form, with the answer being "√2 sin(x −π/4)" 7B) asks for the period , amplitude , and phase angle, to sketch "−4cos(x + π/2)." How does that equal "4sin x" ? Any clarification would be very much appreciated?

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oh, just to be clear that last sentence should not be a question

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