Объяснение:
1.
sin²2α+cos²2α+ 1/tg²5α=
=1 + 1/tg²5α= (tg²5α + 1 )/ (tg²5α)
2.
(1+sin x/2)(1-sin x/2)=1 - sin(x/2)²=cos(x/2)²
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Объяснение:
1.
sin²2α+cos²2α+ 1/tg²5α=
=1 + 1/tg²5α= (tg²5α + 1 )/ (tg²5α)
2.
(1+sin x/2)(1-sin x/2)=1 - sin(x/2)²=cos(x/2)²