number 3 please Lecture Notes c x M Math Lessons and x solve Trigonomet x D Subm
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number 3 please
Lecture Notes c x M Math Lessons and x solve Trigonomet x D Submit Home I Chegg co x Written Homeno x Hwy Math007s17 x dent Performa X C Secure https blackboard,howard.ed 1/courses/MATH00/o4201/01/Hw9 Math00iS pdf 1. (4 points) p. 662/29 Use algebra to solve the equation csc (a 2. a) Write the solution set b) TI ite the sol he interval [0, 2T See amples 2-4 general Extra. (2 points) Graph y esc (T-i) and y 2 on the interval [0 2T) with clear labels on a axes. Label the solutions to the equation found in (a) on the graph. 2. (4 points) p. 663/40 Write the equation 2coes2 z 5cces ar 2 in factored form and th solve the equalion on the val [0,2 See Exampl 5-7) 3. (4 points) p. 663/52 Use an identity to solve the equation cos 30 cos 0 sin 20 on the interval 0.2 See Examples 8-10 4. 3 points) p, 680/21 An airplane climbs at an angle of 110 at an average speed of 420 mph. (a) IIow long will it take for the plane to reach its cruising altitude of 6.5 mi? Round to the nearest minute. (b) Include a diagram labeling the airplane, angle, and the sides. (c) Also include the trigonometric equation used. a e we Ask me any 624 PM 3/8/2017 T42Explanation / Answer
cos3theta - costheta = sin2theta
Use identity : cosx - cosy = -2sin(x+y)/2sin(x -y)/2
So, -2sin(2theta)sintheta = sin 2theta
-2sin(2theta)sintheta - 2sinthetacostheta =0
-4sin^2thetacostheta - 2sinthetscostheta =0
-2sinthetacostheta[ 2sinthea +1 ] =0
sin2theta[2sintheta +1) =0
sintheta = -1/2
sin2theta =0
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