First slide
Extreme values and Periodicity of Trigonometric functions
Question

If the minimum value of sinx+cosx+tanx+cotx+secx+cosecx,xR is m+n then m + n equal (m,nz)

Difficult
Solution

Playing a little bit with the expression one discovers that if 

we get t=sinx+cosx,t212=sinx cosx,then given expression =t+1t212+tt212

=t+2t21+2tt21y=t+2t1=t1+2t1+1

If 1<t2 then y=t1+2t1+122+1

If 2t<1 then y=1+1t+21t221

ymin=221=81m+n=7

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