In whole, you may use me in the measuring.
With my $1^{st}$ & $2^{nd}$ part, you may use me in the coloring.
With my $2^{nd}$ & $3^{rd}$ part, you may use me in the casting.
With my $3^{rd}$ & $4^{th}$ part, you may use me in the integrating.
With my $4^{th}$ & $5^{th}$ part, you may use me in the displaying.
With my $5^{th}$ & $6^{th}$ part, you may use me in the lighting.
Who/What am I?
Hint 1:
For functions in each clause:
measuring -> for the projection
coloring -> for the decoration
casting -> for the hardness
integrating -> for the conduction
displaying -> for the monitor
lighting -> for the attraction
Hint 2:
Add Knowledge tag
Hint 3:
All the parts mentioned in clauses has the same length
Answer
I'm almost certain the answer is
cosine
In whole, you may use me in the measuring.
If $\theta$ is the angle measured counterclockwise from the $x$-axis along the arc of the unit circle then $\cos \theta$ is the horizontal coordinate of the arc endpoint, i.e, the length of the projection of the radius onto the horizontal axis.
With my 1st & 2nd part, you may use me in the coloring.
Co - the chemical symbol for cobalt, which is used in pigments such as cobalt blue, cerulean clue and cobalt green.
With my 2nd & 3rd part, you may use me in the casting.
Os - the chemical symbol for Osmium. Manufacturers use its alloys with platinum, iridium, and other platinum-group metals in applications that require extreme durability and hardness.
With my 3rd & 4th part, you may use me in the integrating.
Si - the chemical symbol for Silicon, which is used heavily in integrated electric circuits.
With my 4th & 5th part, you may use me in the displaying.
In - the checmical symbol for Indium. The primary consumption of indium worldwide is LCD production.
With my 5th & 6th part, you may use me in the lighting.
Ne - the chemical symbol for Neon, which is often used in signs and produces an unmistakable bright reddish-orange light.
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