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નીયોના આપેલા પ્રશ્ર્ન નંબર 9 થી 14 ની મા...

નીયોના આપેલા પ્રશ્ર્ન નંબર 9 થી 14 ની માગ્યા મુજખ ગણતરી કરી જવાખ આપો ( દરેકના 3 ગુણ છે.)
એક રેખા સંમધનના વિકર્ણો સાથે `alpha`, `beta`, `gamma` અને `delta` ખૂણ ખનાવે છે. સાખિત કરો કે `cos ^(2) alpha +cos^(2) beta+ cos^(2) gamma+ cos^(2) delta =4/3`

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The correct Answer is:
`phi=theta=tan^(-1)((sqrt(5))/(3))`
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