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anonymous
 one year ago
use the law of cosines to find the value of 2⋅3⋅4 cosθ
anonymous
 one year ago
use the law of cosines to find the value of 2⋅3⋅4 cosθ

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0what do you mean by 2⋅3⋅4 cosθ You mean \[\cos 2\theta\quad,\cos3\theta,\quad \cos3\theta\]?

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.1Do you have a triangle that corresponds to this question?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1438361201942:dw

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.1This is the law c^2=A^2+b^2−2abcosC

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.14=16+92(4)(3)cosC 21=24cosC 0.875=cosC C= 28.96

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0A. 24 B. 21 C. 24 D. 21

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.1I just understood the whole 2,3,4 thing and ya it is equal to 21 I just assume you had to solve for the angle

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0can you help me with another question please? @taramgrant0543664

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1438362470160:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Suppose a triangle has sides a, b, and c, and that a2 + b2 > c2. Let be the measure of the angle opposite the side of length c. Which of the following must be true? Check all that apply.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0A. cos < 0 B. cos > 0 C. is an acute angle. D. The triangle in question is a right triangle.

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.1I'd like to think it would be D but I'm not certain

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0its more than 1 answer

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.1A and D that's what I'm thinking

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Suppose a triangle has sides a, b, and c, and the angle opposite the side of length b is obtuse. What must be true?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0A. b2 + c2 < a2 B. a2 + c2 > b2 C. a2 + c2 < b2 D. a2 + b2 < c2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i think it a @taramgrant0543664

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.1Ya I was trying to think it out and I was thinking it was A but I was testing out the other options too to double check

phi
 one year ago
Best ResponseYou've already chosen the best response.1Suppose a triangle has sides a, b, and c, and the angle opposite the side of length b is obtuse. What must be true? they tell you about angle B (opposite side b) is bigger than 90 degrees (i.e. obtuse) I would write down the law of cosines in the form that uses angle B (because that is the angle we know about) b^2 = a^2 + c^2  2 a c cos B next, we (should!) know cos of an angle bigger than 90 (but less than 180) is negative in other words  2 ac cos B will turn into a positive number (because 2 * neg cos will be positive) in other words, we can say b^2 = a^2 + c^2 + more if we subtract off more from the right side, the right side will no longer be equal to the left side ... it will be too small. we can say b^2 > a^2 + c^2 or (means the same thing) a^2 + c^2 < b^2
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