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CBSE Class 12-science Answered

If 
begin mathsize 20px style cos to the power of negative 1 end exponent alpha plus cos to the power of negative 1 end exponent beta plus cos to the power of negative 1 end exponent gamma equals 3 straight pi comma then space straight alpha open parentheses straight beta plus straight gamma close parentheses plus straight beta open parentheses straight gamma plus straight alpha close parentheses plus straight gamma open parentheses straight alpha plus straight beta close parentheses equal colon straight i.0 space space space ii.1 space space space iii.6 space space space iv.12 end style
Asked by sunil2791 | 08 Jul, 2017, 07:48: PM
answered-by-expert Expert Answer
begin mathsize 16px style cos to the power of negative 1 end exponent alpha plus cos to the power of negative 1 end exponent beta plus cos to the power of negative 1 end exponent gamma equals 3 straight pi rightwards double arrow cos to the power of negative 1 end exponent straight alpha equals cos to the power of negative 1 end exponent straight beta equals cos to the power of negative 1 end exponent straight gamma equals straight pi rightwards double arrow straight alpha equals straight beta equals straight gamma equals cosπ equals negative 1 straight alpha open parentheses straight beta plus straight gamma close parentheses plus straight beta left parenthesis straight alpha plus straight gamma right parenthesis plus straight gamma left parenthesis straight alpha plus straight beta right parenthesis equals negative 1 open parentheses negative 1 minus 1 close parentheses minus 1 open parentheses negative 1 minus 1 close parentheses minus 1 open parentheses negative 1 minus 1 close parentheses equals 6 end style
Answered by Sneha shidid | 08 Jul, 2017, 09:50: PM

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