Відповідь: А) 0 .
Пояснення:
[cos(-13π/3 )- sin( 7π/6) ]/tg(- π/4) = [ cos( 13π/3 ) - sin( π + π/6 )]/tg(- π/4 ) =
= [cos( 4π + π/3) - sin( π + π/6 ) ]/[- tg( π/4)] = (cosπ/3 - sinπ/6 )[- tg( π/4 ) ] =
= ( 1/2 - 1/2 )/(- 1 ) = 0/(- 1 ) = 0 .
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Answers & Comments
Відповідь: А) 0 .
Пояснення:
[cos(-13π/3 )- sin( 7π/6) ]/tg(- π/4) = [ cos( 13π/3 ) - sin( π + π/6 )]/tg(- π/4 ) =
= [cos( 4π + π/3) - sin( π + π/6 ) ]/[- tg( π/4)] = (cosπ/3 - sinπ/6 )[- tg( π/4 ) ] =
= ( 1/2 - 1/2 )/(- 1 ) = 0/(- 1 ) = 0 .