Y2 Chapter 7 - Trigonometry & Modelling

Chapter
7 -




Trig +
Modelling




Year 2

,Addition/subtractionFormstas


AdditionAngle Formula
Prof
sin(a ) sinxcos
+ =


cosa
+



si




Formula
Subtraction
Angle Proof

Sin(A-B) sin(A =

+
(- r3)) imAcost)
=




sin
-




-sin(A) cos( B) cos() +

(n (-13)
sin(A-B) sinAcosB-cosA sin
=




of Helpfulness!!
Box


cos(x) cos( x)
=
-




sin(-xe) =-Sin(x)

cos() sin
=




( x)-

, by.
(5) cos(1st sin (5) (5)
Sin (20) =


sin
+

cos




(40)
Six sin
=




(50) cos(0) -




<in(0)cos(50)

im (60) sin
=




(90) cos()0-sin(0)cos(90)



Application
Sin (x+) the
in
form painse grosses
+




= Sinse cost sin * cosse




-


- since
losse