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Grade: 12
        

tan(90+x)=tan(x-50)tan(x)tan(x+50) wht is the min value of    ''x''?


 

10 years ago

Answers : (1)

Ramesh V
70 Points
							

tan (90+x)/tan x = tan( x+50). tan (x-50)/1

using componendo and dividendo priciple , we have

(tan (90+x) + tan x) /( tan (90+x) - tan x )= (tan( x+50). tan (x-50) + 1) / (tan( x+50). tan (x-50) - 1)

Sin (90+2x) / sin 90 = cos 100 / cos 2x

here sin 90 = 1

so, by multiplying 2 on both sides we have

2 sin(2x+90).cos 2x + 2 cos 100 = 0

sin (4x+100) + 1+ 2cos 100 =0

on simplification gives

cos 4x + 1 - 2.sin 10 = 0

2* cos22x = 2* sin 10

so, cos22x = sin 10

so , x = cos-1[(sin 10)1/2] / 2

 

 

 
10 years ago
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