Question

Vă rog, exercițiul 3, 4 și 5. Sau măcar cele pe care le știți. Mulțumesc anticipat

Answer 1

Răspuns:

Explicație pas cu pas:

3.

sin45° =√2/2 ; cos45° = √2/2

√2/2 + √2/2 = 2*√2/2= √2

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sin60° = √3/2; tg60° = √3

√3/2 * √3 = 3/2

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cos30° = √3/2; ctg30° = √3

√3/2 * √3 = 3/2

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sin30° = 1/2; cos60° = 1/2

(1/2) / (1/2) = 1

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cos30° = √3/2; sin60° = √3/2

(√3/2) / (√3/2) = 1

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4.

sin30° = 1/2; cos30° = √3/2; tg30° = 1/√3

sin30°/cos30° = (1/2)/(√3/2) = 1/√3 = tg30°

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sin45° =√2/2 ; cos45° = √2/2; tg45° = 1

sin45°/cos45° = (√2/2)/(√2/2) = 1 = tg45°

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ctg60° = 1/√3; cos60° = 1/2; sin60° = √3/2

cos60° /sin60°  = (1/2)/(√3/2) = 1/√3 = ctg60°

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ctg30° = √3; cos30° = √3/2; sin30° = 1/2

cos30° /sin30° = (√3/2)/(1/2) = √3 =  ctg30°

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tg30° = 1/√3;  ctg30° = √3

1/ ctg30° = 1/√3 = tg30°

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