How would you go about doing this on ti nspire cx cas:

Find the equation of the line that is tangent to the curve

y=5xcosx

at the point (π,−5π).

The equation of this tangent line can be written in the form y=mx+b where

m=

and b=

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Well, you could edit the string using the sub command, which allows you to take parts of strings....

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**CHAR**- → ∟ ⌊ ‾
- × ÷ ±
- √ Σ ≠
- ≥ ≤ π
- Δ χ ▶
- ֿ¹ ² ³
- L₁ L₂ L₃
- L₄ L₅ L₆
- ≅ ℕ º
- θ ∠ ∞
- ♦ ⇧ ∫
- ∏ ©

tangent line on ti nspire