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Question Number 164524 by daus last updated on 18/Jan/22

Answered by mindispower last updated on 18/Jan/22

polar coordinat (r,a)⇒(r,a+(π/4))

$${polar}\:{coordinat}\:\left({r},{a}\right)\Rightarrow\left({r},{a}+\frac{\pi}{\mathrm{4}}\right) \\ $$

Commented by mindispower last updated on 18/Jan/22

cos(a+(π/4))=(1/( (√2)))(cos(a)−sin(a))

$${cos}\left({a}+\frac{\pi}{\mathrm{4}}\right)=\frac{\mathrm{1}}{\:\sqrt{\mathrm{2}}}\left({cos}\left({a}\right)−{sin}\left({a}\right)\right) \\ $$

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