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CBSE Class 11-science Answered

find angle between A= 3i+4j and B=12i+5j
Asked by puneetgarg2555 | 27 May, 2018, 07:52: AM
answered-by-expert Expert Answer
begin mathsize 16px style straight A space equals space 3 straight i space plus space 4 straight j straight B space equals space 12 straight i space plus space 5 straight j straight A with rightwards arrow on top space. space straight B with rightwards arrow on top space equals space space open vertical bar straight A with rightwards arrow on top close vertical bar space open vertical bar straight B with rightwards arrow on top close vertical bar cosθ rightwards double arrow space cosθ space space equals space fraction numerator straight A with rightwards arrow on top space. space straight B with rightwards arrow on top space over denominator open vertical bar straight A with rightwards arrow on top close vertical bar space open vertical bar straight B with rightwards arrow on top close vertical bar end fraction equals fraction numerator left parenthesis 3 straight i space plus space 4 straight j right parenthesis. left parenthesis 12 straight i space plus space 5 straight j right parenthesis over denominator square root of 25 square root of 169 end fraction space equals space 56 over 65 equals 0.8615 rightwards double arrow space straight theta space space equals cos to the power of negative 1 space end exponent left parenthesis space 0.8615 right parenthesis space equals space 30.51 degree end style
Answered by Yasmeen Khan | 28 May, 2018, 11:14: AM

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CBSE 11-science - Maths
if log 1/2 x greater than log 1/2 y then x greater than y
Asked by megaladevi07 | 24 Jul, 2024, 11:01: AM
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CBSE 11-science - Maths
1+sinx+cosx/1+sinx-cosx=cotx/2
Asked by mihirkumarjha356 | 18 Jul, 2024, 21:51: PM
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CBSE 11-science - Maths
find the circumcentre of (1,3) (0,-2) (-3,1)
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CBSE 11-science - Maths
if a = [[2, 3], [1, 4]] and b = [[5, 0], [3, 2]] then find a + b ?
Asked by shshnkmanjula | 08 Jul, 2024, 17:25: PM
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CBSE 11-science - Maths
|x-3|+2|x+1|=4
Asked by harshdasisode | 04 Jul, 2024, 00:07: AM
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CBSE 11-science - Maths
ax^2+bx+c=0 then x=
Asked by manjushakothavade1979 | 25 Jun, 2024, 10:29: AM
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CBSE 11-science - Maths
prove using identities cos4xsin3x-cos2xsinx/sin4xsinx+cos6xcosx =tanx
Asked by ishanvi.pahil | 22 Jun, 2024, 22:31: PM
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CBSE 11-science - Maths
answer
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Asked by jagathaiah.kamsali | 13 Jun, 2024, 20:20: PM
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CBSE 11-science - Maths
find distance between two points A(5,-4) B(7,6)
Asked by nandhandheeraj7474 | 11 Jun, 2024, 17:23: PM
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CBSE 11-science - Maths
3. Calculate the mean and standard deviation using short cut method for the following distribution Marks Frequency 20-30 3 30-40 6 40-50 13 50-60 15 60-70 14 70-80 5 80-90 4
Asked by nvprithica | 07 Jun, 2024, 11:53: AM
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