HP Prime Graphing NW280AAABA manual Asin2atanExpr, Sin2costanExpr, Acos2asinExpr, Acos2atanExpr

asinx → atanx Returns an expression with asin(x) rewritten as:

⎛x ⎞ atan⎜ -------------------⎟

⎝ 1 – x2⎠

asin2atan(Expr)

Example:

asin2atan(2*asin(x)) returns

	⎛	x	⎞
2	⋅ atan ⎜	-------------------⎟
			2
	⎝	1 – x	⎠

sinx → cosx*tanx Returns an expression with sin(x) rewritten as cos(x)*tan(x).

sin2costan(Expr)

Example:

sin2costan(sin(x)) gives tan(x)*cos(x)

Cosine

acosx → asinx Returns an expression with acos(x) rewritten as π/2–asin(x).

acos2asin(Expr)

Example: acos2asin(acos(x)+asin(x)) returns π/2

acosx → atanx Returns an expression with acos(x) rewritten as:

π

--- – 2

⎛ x ⎞ atan ⎜ -------------------⎟ ⎝ 1 – x2⎠

acos2atan(Expr)

Example:

acos2atan(2*acos(x)) gives

2⋅ ⎛ π

⎜--- –

⎝ 2

⎛ x ⎞⎞ atan⎜ -------------------⎟⎟ ⎝ 1 – x2⎠⎠

cosx → sinx/tanx Returns an expression with cos(x) rewritten as sin(x)/tan(x).

cos2sintan(Expr)

Example:

cos2sintan(cos(x)) gives sin(x)/tan(x)

334 Functions and commands