solvefor c,cos^4(s)-sin^4(x)+1+cos(x)=0

解答

求解

c, cos^{4} (s) - sin^{4} (x) + 1 + cos (x) = 0

对所有 c 为真; cos^{4} (s) - sin^{4} (x) + 1 + cos (x) = 0

求解步骤

cos^{4} (s) - sin^{4} (x) + 1 + cos (x) = 0

两侧相等

对所有 c 为真; cos^{4} (s) - sin^{4} (x) + 1 + cos (x) = 0

so l v e f or c, cot^{2} (x) = cos (x) + sin (x)

so l v e f or y, y = sin (3 t) u (t) \cdot u (t)

so l v e f or t, cot (a \cdot) (1 - sec (2 a)) + tan^{2} (a) = 1

y = 7 cos^{2} (- 3)

cos (22 0^{\circ}) = \frac{a}{3}