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=1+tan²x-cos²x-tan²x.cos²x
=1+(sin²x/cos²x)-cos²x-(sin²x/cos²x).cos²x
=(cos²x/cos²x)+(sin²x/cos²x)-cos²x-sin²x
=(cos²x+sin²x)/cos²x-(sin²x+cos²x)
=1/cos²x-1
=1/cos²x-(cos²x/cos²x)
=(1-cos²x)/cos²x
=sin²x/cos²x
=tan²x