1.

. Determine the angJ U, Find a value of A when cos 2Asin3 A.10no

Answer»

cos2A = sin3A==> cos2A = cos(90 - 3A)

==> Either 2A = 90 - 3A or 2A = -(90 - 3A)==> 5A = 90 or 2A = -90 +3A==> A = 18 or A = 90. These are the solutions from 0 degrees to 360 degrees.

WhySin3A to cos(90-3A) to convert



Discussion

No Comment Found