if 2 cos^ 2 thita -11 cos thita +5=0. then find value of cos thita
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Answer:
Step-by-step explanation:
Let thita=A
2 cos^2A - 11 cos A + 5 = 0
2cos^2A -cos A - 10 cos A + 5 = 0
cos A( 2cos A -1)-5(2cos A -1)=0
(cos A - 5)(2cos A -1)=0
cos A=5 or 1/2
cos A =1/2
cos A=cos 60
A=thita=60.
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