cos a : 1/cos a = cos a * cos a = cos² a
sin a : 1/sin a = sin a * sin a = sin² a
cos² a + sin² a + tg² a = 1 + sin² a / cos² a = (cos² a + sin² a)/cos² a = 1/cos² a
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cos a : 1/cos a = cos a * cos a = cos² a
sin a : 1/sin a = sin a * sin a = sin² a
cos² a + sin² a + tg² a = 1 + sin² a / cos² a = (cos² a + sin² a)/cos² a = 1/cos² a
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