How to find values of Trigonometric Ratios for 30° and 60° and 45 degree
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Refer pg no ...5.29
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Answer:
The trigonometric ratios for 30o, 45o, and 60o are based on some standard triangles. sin, cos, and tan (and their reciprocals) are the ratios of the sides of these triangles.
Explanation:
Both 30o and 60o are based on an equilateral triangle with sides of length 2 and with one of the angles bisected.
The 45o angle is based on an isosceles triangle with the equal sides having a length of 1.
For all triangles the Pythagorean Theorem is used to compute the "missing" side length.

If remember that
XXXXsin =oppositehypotenuse
XXXXcos =adjacenthypotenuse
XXXXtan =oppositeadjacent
and their reciprocals.
Then, for example:
XXXXsin(60o)=√32
XXXXsin(30o)=12
XXXXsin(45o)=1√2
XXXXcos(60o)=12
etc.
The trigonometric ratios for 30o, 45o, and 60o are based on some standard triangles. sin, cos, and tan (and their reciprocals) are the ratios of the sides of these triangles.
Explanation:
Both 30o and 60o are based on an equilateral triangle with sides of length 2 and with one of the angles bisected.
The 45o angle is based on an isosceles triangle with the equal sides having a length of 1.
For all triangles the Pythagorean Theorem is used to compute the "missing" side length.

If remember that
XXXXsin =oppositehypotenuse
XXXXcos =adjacenthypotenuse
XXXXtan =oppositeadjacent
and their reciprocals.
Then, for example:
XXXXsin(60o)=√32
XXXXsin(30o)=12
XXXXsin(45o)=1√2
XXXXcos(60o)=12
etc.
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