Important Formulae based on the concept of Allied angles
- 9 years ago
Lesson#2
Important Formulae based on the concept of Allied angles:
Important Points about the use of the concept of Allied angles
If θ is added to or subtracted from odd multiple of right angle, the trigonometric ratios change into co−ratios.
If θ is added to or subtracted from an even multiple of right angle, the trigonometric ratios shall remain same.
Sign of the result is determined by the original trigonometric ratio by the use of the quadrant in which angle lies.
Example: csc(1003 /2+)=sec
Trigonometric Identities
Chapter No 10
Exercise No 10.1
Mathematics
part 1
Important Formulae based on the concept of Allied angles:
Important Points about the use of the concept of Allied angles
If θ is added to or subtracted from odd multiple of right angle, the trigonometric ratios change into co−ratios.
If θ is added to or subtracted from an even multiple of right angle, the trigonometric ratios shall remain same.
Sign of the result is determined by the original trigonometric ratio by the use of the quadrant in which angle lies.
Example: csc(1003 /2+)=sec
Trigonometric Identities
Chapter No 10
Exercise No 10.1
Mathematics
part 1