Giải phương trình cos(x) + sin(x) = c, với c để phương trình có nghiệm liên quan đến cosx = -1/2?

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e−ix=cos(−x)+isin(−x),=cosx−isinx. Oct 17, 2011 ... Weierstrass substitution works for this integral, and it's not even that messy to work with. Substitute tanx2=t, so that cosx=1−t21+t2 and ... Here cos x = - 12. Now sin2x+cos2 x =1. ⇒sin2x+(−12)2=1. ⇒sin2x=1−14. ⇒sin2x=34. ⇒sinx=±√32. But x lies in third quadrant. ∴ sin x =- √32. Now cosec x = 1sinx= ... Apr 4, 2009 ... Since x = (1/2)(2x) = (2)(x/2), then you can restate the equation in terms only of sin ( 2 x ) , and then solve the resulting quadratic. ... cos x, Monatshefte für Mathematik, Vol. 69, No. 2 (1965), pp. 129-135. %H ... 1 - 2^2*x / (1 - (3^2+1)*x / (1 - 4^2*x / (1 - (5^2+1)*x / (1 - 6^2*x ... NCERT solutions for CBSE and other state boards is a key requirement for students. Doubtnut helps with homework, doubts and solutions to all the questions. It ... May 9, 2015 Use the trig identity: cosx=1−2sin2(2x​) −41​=1−2sin2(2x​)→sin2(2x​)=85​=0.625 ... Jul 29, 2022 ... ... 12×3×2×sin120∘=3√32. Use the sine rule: ... There are two inequalities here; tanx

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cosx=-1/2


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