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

Harshit Singh
one year 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)(pi/4)

Thanks
Debarati
105 Points
one year 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