Determine Radian Value of Trig Ratio cosx Q6 p 331 Nelson MHF4U

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#RadianMeasurements #ModellingPeriodicFunctions #modelling_Trigonometric_Functions #mhf4u_trigonometry_unit_6 #angularvelocity #mhf4utrigonometry #MHF4U_Trigonometry_Unit_6, #advancedfunctions
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Thank you very much, every time I ever had a math related question I would search it up and you’d be the first name to pop up

prodbyny
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U said that cos is negative in quadrant 3 isn't cos also negative in quadrant 2. So why didnt u draw the line there? And why are we adding for the first question but subtracting for the 2nd one?

sanaa
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Why did you use the 30 60 triangle and not the 45 triangle?

sophietindal