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please help me by solving 7, 8, and 9. these are sums from class 11 tuitions.

please help me by solving 7, 8, and 9. these are sums from class 11 tuitions.

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Grade:9

2 Answers

Harshit Singh
askIITians Faculty 5963 Points
3 years ago
Dear Student

7 . Tan x = √3 is for 60,(180+60) i.e 60 and 240 degrees
8. cos x= √3/2 is true for 30,(360-30),360+30,720-30.
9. sinx= +1/√2 or –1/√2 is true for n(pi)\pm(pi/4)


Thanks
Debarati
105 Points
2 years ago
7. tan theta = root 3 when theta = 60
8. 2 cos theta = root 3
=> cos theta = (root 3)/2
=> theta = 30
9. 2 sin^2 theta = 1
=> sin^2 theta = 1/2
=> sin theta = 1/root 2
=> theta = 30

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