sinα = 3/4
cos²α = 1-sin²α = 1-(3/4)² = 16/16 - 9/16 = 7/16
coaα = √(7/16) = √7/4
tgα = sinα/cosα = 3/4 : √7/4 = 3/4 ·4/√7 ·√7/√7 = 3√7/7
ctgα = 1/tgα = 7/3√7 · √7/√7 = 7√7/21 = √7/3
sin²α+cos²α = 1
tgα·ctgα = 1
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sinα = 3/4
cos²α = 1-sin²α = 1-(3/4)² = 16/16 - 9/16 = 7/16
coaα = √(7/16) = √7/4
tgα = sinα/cosα = 3/4 : √7/4 = 3/4 ·4/√7 ·√7/√7 = 3√7/7
ctgα = 1/tgα = 7/3√7 · √7/√7 = 7√7/21 = √7/3
sin²α+cos²α = 1
tgα·ctgα = 1