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sabika13
how do i prove this using trig identity: (2sinx+3cosx)^2+(3sinx-2cosx)^2=13
i did this on my calculator type it in your calulator just as your type on here tell me what you get
i have to prove it using trigonometric identity without a calculator
First, use foil to expand them. Then use the following identity \[ \sin^2(\theta)+\cos^2(\theta)=1 \]
what do i do with the leading coefficients?