Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

maths
Asked by durgaprasaddurgaprasad174 | 01 Jul, 2022, 05:05: PM
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
CBSE 12-science - Maths
Asked by durgaprasaddurgaprasad174 | 01 Jul, 2022, 05:05: PM
ANSWERED BY EXPERT
CBSE 12-science - Maths
Asked by abhimeena1011 | 18 Jan, 2022, 10:43: AM
ANSWERED BY EXPERT
CBSE 12-science - Maths
Asked by akshitaasia | 19 Mar, 2018, 11:04: AM
ANSWERED BY EXPERT
CBSE 12-science - Maths
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT
CBSE 12-science - Maths
Asked by Topperlearning User | 13 Aug, 2016, 02:21: AM
ANSWERED BY EXPERT
CBSE 12-science - Maths
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT
CBSE 12-science - Maths
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT
CBSE 12-science - Maths
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT
CBSE 12-science - Maths
Asked by Topperlearning User | 03 Mar, 2015, 01:45: PM
ANSWERED BY EXPERT

Start your hassle free Education Franchisee and grow your business!

Know more
×