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How to easily remember Trigonometric
ratios of standard angles
by
SBR
www.harekrishnahub.com
Step1: Prepare a table (with 4 rows and 6 columns)
www.harekrishnahub.com
Step 2: write down 0°, 30°, 45°, 60°and 90° in the top row.
www.harekrishnahub.com
0° 30° 45° 60° 90°
Step 3: write sine, cos and tan in the first column.
www.harekrishnahub.com
0° 30° 45° 60° 90°
sine
cos
tan
Step 4:
write 0, 1, 2, 3, 4 in the row corresponding to the sine row.
www.harekrishnahub.com
0° 30° 45° 60° 90°
sine 0 1 2...
Step 5: Divide each number in the sine row by 4
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0° 30° 45° 60° 90°
sine
0
4
1
4
2
4
3
4
4
4
cos
tan
Step 6: Take square root of each of the ratios.
www.harekrishnahub.com
0° 30° 45° 60° 90°
sine
0
4
1
4
2
4
3
4
4
4
cos
tan
Step 7: On Simplification, we the get ratios for the sine as show
below.
www.harekrishnahub.com
0° 30° 45° 60° 90°
sine 0
...
Step 8: To get the ratios for cosine, reverse them for the cos
row.
www.harekrishnahub.com
0° 30° 45° 60° 90°
sine 0
1
2
1...
Step 9:
To obtain the ratios for tan, divide the sine row cos row
www.harekrishnahub.com
0° 30° 45° 60° 90°
sine 0
1
2
1
2...
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How to easily remember trigonometric ratios of standard angles

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How to easily remember trigonometric ratios of standard angles

  1. 1. How to easily remember Trigonometric ratios of standard angles by SBR www.harekrishnahub.com
  2. 2. Step1: Prepare a table (with 4 rows and 6 columns) www.harekrishnahub.com
  3. 3. Step 2: write down 0°, 30°, 45°, 60°and 90° in the top row. www.harekrishnahub.com 0° 30° 45° 60° 90°
  4. 4. Step 3: write sine, cos and tan in the first column. www.harekrishnahub.com 0° 30° 45° 60° 90° sine cos tan
  5. 5. Step 4: write 0, 1, 2, 3, 4 in the row corresponding to the sine row. www.harekrishnahub.com 0° 30° 45° 60° 90° sine 0 1 2 3 4 cos tan
  6. 6. Step 5: Divide each number in the sine row by 4 www.harekrishnahub.com 0° 30° 45° 60° 90° sine 0 4 1 4 2 4 3 4 4 4 cos tan
  7. 7. Step 6: Take square root of each of the ratios. www.harekrishnahub.com 0° 30° 45° 60° 90° sine 0 4 1 4 2 4 3 4 4 4 cos tan
  8. 8. Step 7: On Simplification, we the get ratios for the sine as show below. www.harekrishnahub.com 0° 30° 45° 60° 90° sine 0 1 2 1 2 3 2 1 cos tan
  9. 9. Step 8: To get the ratios for cosine, reverse them for the cos row. www.harekrishnahub.com 0° 30° 45° 60° 90° sine 0 1 2 1 2 3 2 1 cos 1 3 2 1 2 1 2 0 tan
  10. 10. Step 9: To obtain the ratios for tan, divide the sine row cos row www.harekrishnahub.com 0° 30° 45° 60° 90° sine 0 1 2 1 2 3 2 1 cos 1 3 2 1 2 1 2 0 tan 0 1 3 1 3 ∞

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