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CBSE Class 10 Answered

state true or false  please explain the answer
question image
Asked by gpnkumar0 | 15 Feb, 2018, 10:02: PM
answered-by-expert Expert Answer
begin mathsize 16px style cosθ equals fraction numerator straight a squared plus straight b squared over denominator 2 ab end fraction
We space know space that space left parenthesis straight a minus straight b right parenthesis squared equals straight a squared minus 2 ab plus straight b squared rightwards double arrow straight a squared plus straight b squared equals left parenthesis straight a minus straight b right parenthesis squared plus 2 ab
rightwards double arrow cosθ equals fraction numerator left parenthesis straight a minus straight b right parenthesis squared plus 2 ab over denominator 2 ab end fraction
rightwards double arrow cosθ equals fraction numerator left parenthesis straight a minus straight b right parenthesis squared over denominator 2 ab end fraction plus 1 greater than 1 space
Hence comma space maximum space value space of space cosθ space is space one space which space is space false.

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Answered by Sneha shidid | 16 Feb, 2018, 10:48: AM
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