Question

Упростите выражение.

Answer 1

Ответ:

4) =(1-sin^2 (a/8) -(cos^2a +sin^2 a)) /(4sin^4 (a/16))=

=(1-sin^2 (a/8) -1) /(4*sin^4 (a/16))=

=(  -( 2sin(a/16) cos(a/16))^2 ) /(4sin^4 (a/16))=

=(-4sin^2 (a/16) cos^2 (a/16)) /(4sin^4 (a/16))=

=-cos^2 (a/16) /sin^2 (a/16)=-ctg^2 (a/16)

Объяснение:

вот