вычислите cos a и tg a если sin a=-0,6 и пи

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Given sin a = -0.6, we can use the trigonometric identity:

sin^2(a) + cos^2(a) = 1

(-0.6)^2 + cos^2(a) = 1
0.36 + cos^2(a) = 1
cos^2(a) = 1 - 0.36
cos^2(a) = 0.64
cos(a) = ±√0.64
cos(a) = ±0.8

Since sin(a) and cos(a) have opposite signs in the second and third quadrants, where sin is negative, cos(a) will also be negative. Therefore, cos(a) = -0.8.

To find the value of tan(a), we can use the relationship:

tan(a) = sin(a)/cos(a)

tan(a) = -0.6 / -0.8
tan(a) = 0.75

Therefore, cos(a) = -0.8 and tan(a) = 0.75.