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Mathematics in the third grade: Find the sine, cosine and tangent of the two acute angles in the right triangle below.
Pythagorean Theorem of 1, BC=5. The angle b is sine, 12: 13. Tangent, 12: 5. Cosine, 5: 13.

Angle a sine: 5: 13. Tangent: 5: 12. Cosine: 12: 13.

2. Pythagorean theorem for AB= root sign 13.

Angle a. Sine: 3: root sign 13. Cut: 3: 2. Cosine: 2: radical sign 13

Angle b.2. Root number 13. . . Cut: 2: 3. Cosine: 3: root sign 13

Take it.

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