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Ty oczywiście zmień na alfa.
L = [tg²a-sin²a] / cos²a =
[ sin²a / cos²a - sin²a] / cos²a =
[ sin²a/cos²a - (sin²acos²a)/ cos²a] : cos²a=
[ sin²a *(1-cos²a) ] / cos²a * 1/cos²a=
[sin²a *cos²a] / cos⁴a =
sin⁴a / cos⁴a =
tg⁴a =P cnd.