find the minimum value of y
我咁做:
-1<sin^2θ<1
-4<4/sin^2θ<4
-6<4/sin^2θ-2<2
minimum value唔係-6咩?點解answer寫2既?
* < mean 細過等如
2) If x=22.5度,show that tan^2 x+2tan x-1+0 by using double angle formula.Hence find the value of tan 22.5度 in surd form
更新1:
If x=22.5度,show that tan^2 x+2tan x-1+0 by using double angle formula?????
