What is the value of cos(2*(-1.75))+2(-1.75)^2-4 ?

The value of cos(2*(-1.75))+2(-1.75)^2-4 is 1.18854…

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cos(2*(-1.75))+2(-1.75)^2-4

cos (2 \cdot (- 1.75)) + 2 (- 1.75)^{2} - 4

1.18854 \dots

Solution steps

cos (2 (- 1.75)) + 2 (- 1.75)^{2} - 4

Refine to a decimal form

= 1.18854 \dots

\frac{tan ( 6 3 ^{\circ} ) - tan ( 4 8 ^{\circ} )}{1 + ( tan ( 6 3 ^{\circ} ) tan ( 4 8 ^{\circ} ) )}

4 sin (\frac{π}{4}) cos (\frac{π}{6})

arcsin (\frac{20}{25})

[2 (cos (\frac{π}{4}) + i sin (\frac{π}{4}))]^{6}

sin (8.6)

What is the value of cos(2*(-1.75))+2(-1.75)^2-4 ?
The value of cos(2*(-1.75))+2(-1.75)^2-4 is 1.18854…