Know Your Keywords — Math, Standard
Point 2 — Trigonometric properties
What do we see?
sin A, cos (90 − A), sin A = cos B.
What do we understand?
If sin A = cos B, then A + B = 90; and if A + B = 90, then sin A = cos B. Sometimes 90 − A is written in place of B.
Question 1 of 2
If sin (5x − 10) = cos (7x − 20), for a constant x, then what is a possible value of 5x − 10?