Упростить tg²x-sin²x·tg²
tg²x-sin²x·tg²x=tg²x(1-sin²x)=tg²x*cos²x=(sin²x/cos²x) * cos²x=sin²x
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tg²x-sin²x·tg²x=tg²x(1-sin²x)=tg²x*cos²x=(sin²x/cos²x) * cos²x=sin²x