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Vishnu Saran Grade: 10
        

(a) Solve for 0 < θ < 5, the equation 5+3cosec (20θ+1) = 0


(b) FInd all the angles between -1800 and 1800 such that


                  cosec y + 11cot y = 4sin y


Thanks,


Vishnu

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear Vishnu


a )


5+3cosec (20θ+1) = 0


sin(20θ+1)=-3/5


0 < θ < 5


so  1 < 20 θ +1< 101


for this angel range sin (20θ+1) will always be positive so no solution


b)


cosec y + 11cot y = 4sin y


simplify    4cos2y +11cosy -3=0


 this give cos y=-7/4 and 3/2   which is not posible so no solution exits





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Badiuddin

7 years ago
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