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CBSE Class 12-science Answered

maths
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Asked by durgaprasaddurgaprasad174 | 01 Jul, 2022, 05:05: PM
answered-by-expert Expert Answer
Let l, m and n be the direction cosines of a vector
rightwards double arrow straight l equals cosα comma space straight m equals cosα space and space straight n equals cos 90 to the power of straight o rightwards double arrow straight n equals 0 We space know space that comma space straight l squared plus straight m squared plus straight n squared equals 1 rightwards double arrow cos squared straight alpha plus cos squared straight alpha plus 0 equals 1 rightwards double arrow 2 cos squared straight alpha equals 1 rightwards double arrow cos squared straight alpha equals 1 half rightwards double arrow cosα equals plus-or-minus fraction numerator 1 over denominator square root of 2 end fraction rightwards double arrow straight alpha equals cos to the power of negative 1 end exponent open parentheses fraction numerator 1 over denominator square root of 2 end fraction close parentheses space space or space space straight alpha equals cos to the power of negative 1 end exponent open parentheses negative fraction numerator 1 over denominator square root of 2 end fraction close parentheses rightwards double arrow straight alpha equals 45 to the power of straight o space space or space straight alpha equals 135 to the power of straight o
Answered by Renu Varma | 04 Jul, 2022, 11:10: AM

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CBSE 12-science - Maths
maths
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Asked by durgaprasaddurgaprasad174 | 01 Jul, 2022, 05:05: PM
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CBSE 12-science - Maths
v=e^xyz(i+j+k) find curl v
Asked by abhimeena1011 | 18 Jan, 2022, 10:43: AM
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CBSE 12-science - Maths
  If a vectors = 2 i – 4 j + 5 k then find value of lamda so that lamda times a (vector) may be a unit vector  i  j and k are unit vector/axis
Asked by haroonrashidgkp | 23 Oct, 2018, 07:06: PM
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CBSE 12-science - Maths
Please help me with this question
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Asked by akshitaasia | 19 Mar, 2018, 11:04: AM
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CBSE 12-science - Maths
Find the distance between the point A(– 1, 2, 3) and B(1, – 1, – 3).
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Maths
Find the vector joining the points P(– 2, – 3, 4) and Q(3, 2, 5) directed from P to Q. Also find the distance between the points.
Asked by Topperlearning User | 13 Aug, 2016, 02:21: AM
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CBSE 12-science - Maths
If , then find the value of
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Maths
Find the position vector of mid-point of joining the points (6, – 2, 3) and (4, 2, –5).
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Maths
If P, Q and R have position vectors (0, 0, 2), (2, 0, 0) and (0, 1, 0). Show that is an isosceles.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Maths
The position vectors of A, B and C are and . Prove that A, B and C are collinear.
Asked by Topperlearning User | 03 Mar, 2015, 01:45: PM
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