plz explain how to do this question
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- nnn
send me kk s new hi ok ok dii i not
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Answer:
3/5
Step-by-step explanation:
cosec a - cota = 1/2
1/sina - cosa/sina = 1/2
1 - cosa=sina/2
squaring both sides
1 + cos^2a -2cosa= sin^2a/ 4
cos^2a + cos^2a/4 - 2cosa + 3/4 = 0
5cos^2a/4 - 2cosa + 3/4 = 0
5cos^2a - 8cosa + 3 = 0
5cos^2a - 5cosa - 3cosa + 3 = 0
5cosa(cosa -1) -3(cosa-1) = 0
cosa = 1 cosa = 3/5
cosa can not be 1
as 0<cosa<1
cosa = 3/5
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