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3+(1/√15)^2=3+1/15=3 ¹₁₅
cos²α+(1/4)²=1
cos²α+1/16=1
cos²α=1- 1/16
cos²α=15/16
cosα=√15/16
cosα=√15 /4
tgα=sinα/cosα
tgα=1/4 /√15 /4
tgα=1/√15
tgα=√15 /15
3+tg²α=3+ 15/225
3+tg²α=3+ 1/15
3+tg²α=3 i 1/15