if a=sin170+cos170 then
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Given,
a=sin170
o
+cos170
o
=sin(180−10)+cos(180−10)
=sin10+(−cos10)
=sin10−cos10
Now if θ∈(0,
4
π
)
cosθ>sinθ
∴cos10
o
>sin10
o
∴a=sin10−cos10
=−ve
∴a<10.
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