a) 1 + tg kwadrat alfa = 1/cos kwadrat alfa
b) 1 - sin kwadrat alfa + ctg kwadrat alfa razy sin kwadrat alfa = 2 cos 2 alfa.
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wazne tozsamosci:
sin^2 alpha + cos^2 alpha= 1
tg alfa = sin alfa/ cos alfa
ctg alfa= cos alfa/ sin alfa
a)
b)