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Question Number 26135 by JI Siam last updated on 21/Dec/17

$$\mathrm{Prove}\mathrm{that}\mathrm{b}={2\mathrm{asin}}^2\theta ;$$$$\mathrm{when}\mathrm{acos}\theta -\mathrm{bsin}\theta =\mathrm{c}\mathrm{and}\theta =45°$$

Commented by mrW1 last updated on 21/Dec/17

$$Itisnottruethatb=2a{\sin }^2\theta ifc\ne 0.$$

Answered by ajfour last updated on 21/Dec/17

$$b=athenc=0.$$

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