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 OBJECTIVE - G.SRT.C.7 Explain and use the relationship between the sine and cosine of complementary angles.   INTERPRETATION OF OBJECTIVE - G.SRT.C.7 This directly relates to the co-function relationship between these two ratios. The use of a trigonometric table would be essential here to see the pattern that sin (90 - x) = cos (x). SKILLS (1) The student will be able explain the co-function nature of sine and cosine.   (2) The student will be able to calculate values that would make sine and cosine equal. THE BIG IDEA That sine and cosine are co-functions and that simply a horizontal shift of pi/2. That knowing values of sine can help us determine cosine values as well. TRAPS & PITFALLS When algebraic unknowns are put in the angle locations students want to set the values equal to each other instead of summing to 90 degrees. PAST CONNECTIONS The basic trigonometric ratios of sine and cosine.   FUTURE CONNECTIONS Understanding the concepts underneath the basic trigonometric ratios will help student succeed as we build on trigonometry in future courses. MY REFLECTIONS (over line l) Not much to talk about here.... this is a very straight forward objective and an easy one to address.