Лекция 7. Тригонометричнифункции ...

7. . .

: , , 3

:

(0; 90) 9. .

a

b

sin a

cos b

sin = , cos = , tg =

= , ctg =

=

c

c

cos b

sin a

sin2 + cos2 = 1, tg . ctg = 1

sin(90 - ) = cos , cos(90 - ) = sin , tg(90 - ) = ctg

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7.

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?

7.

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?

( 1 , Oxy). . O, Ox, OM ( ).

. O, . M , .. , , . + 360, + 2.360 .., .

7.

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