zero degree greater than theta greater than 90 degree and 2 cos^2 theta + 5 sin theta - 4 = 0, then theta =?
Answers
Answered by
5
Answer:
Step-by-step explanation:
Consider theta=x
2cos²x+5sinx-4=0
2-2sin²x+5sinx-4=0
2sin²x-5sinx+2=0
Using shridharacharya formula,
Sinx=[-(-5)±√{(-5)²-4*2*2}]/2*2
Sinx=(5±3)/4
Sinx=2. Or. Sinx=1/2
As we know sinx lies between -1 to 1
Sinx≠2
Sinx=1/2
X=30°
Theta=30°...
Hope you understood...!!!!
MARK BRAINLIEST
Answered by
3
Answer:
Step-by-step explanation:
Attachments:
Similar questions