Trigonometry › 45 degrees

Teacher info
Calculate the sine, cosine, and tangent of 45 degrees
CCSS.MATH.CONTENT.HSF.TF.A.3
(+) Use special triangles to determine geometrically the values of sine, cosine, tangent for π/3, π/4 and π/6, and use the unit circle to express the values of sine, cosine, and tangent for x, π + x, and 2π – x in terms of their values for x, where x is any real number.

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https://schoolyourself.org/page/lti/sy/trigonometry/trig-45
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