, reduction
thing equations
*
· ↑
↓
& ↑24
·
&
2. special
trig identities
Solution
↓) solutions triangles
of
& 3P
Sketch angles triangle
of
problems
90'o-ratio
180 0 -
90-8
180 5 A ⑧
TG 360
180 + G 360 -
0
270
identities
sinG
↓ LaRO:C OSO
+ COSG
sin28 1
=
2.
1. Sin?8
=
1 -COS28
simplifying backward
COS8 1-sin28 when there's itdisappear
=
*
C. a onemake
r o o mton o t roomble
I
↓ COS(A-B) COSACOSB
=
+ SiRAsin B Cos change
=
1. SiNIA=I SinACOSA ·
always in in front
2. COS (A B) COSACOSB-sinAsin B
+
=
sin: sign stays 2. COSIA COS"A-sin"
=
A ·
no in frontof
angle halfof original
3. Sin (A-B) SiNACOSB-COSASinB
=
2C052A
=
-
1
Sin (A +B) sinACOSB COSAsinB 25in- A
=
+ 1
=
4.
-
5. tan (A-B) tanA tanB
= +
3. tARZA 2tqnA
=
1 -
tanAt aR B 1 -
tan? A
6. taR (A +B) tamA -tanB
=
1 tanAtanB
+
them e
# ↑
↳
single angle double
angle 1.
angle between 0.360
compound & expand
angle 2. deduce quadrantsign
& expand
has a
boundary 3. Write rati
line
↓ 4. angle between 0-900 use reduction
reduce
special
# ↓
not special
angles &
co-ratio escape routes: 1. double
steps 2. Compound
1. quadrant
2.
sign
3. ratio
thing equations
*
· ↑
↓
& ↑24
·
&
2. special
trig identities
Solution
↓) solutions triangles
of
& 3P
Sketch angles triangle
of
problems
90'o-ratio
180 0 -
90-8
180 5 A ⑧
TG 360
180 + G 360 -
0
270
identities
sinG
↓ LaRO:C OSO
+ COSG
sin28 1
=
2.
1. Sin?8
=
1 -COS28
simplifying backward
COS8 1-sin28 when there's itdisappear
=
*
C. a onemake
r o o mton o t roomble
I
↓ COS(A-B) COSACOSB
=
+ SiRAsin B Cos change
=
1. SiNIA=I SinACOSA ·
always in in front
2. COS (A B) COSACOSB-sinAsin B
+
=
sin: sign stays 2. COSIA COS"A-sin"
=
A ·
no in frontof
angle halfof original
3. Sin (A-B) SiNACOSB-COSASinB
=
2C052A
=
-
1
Sin (A +B) sinACOSB COSAsinB 25in- A
=
+ 1
=
4.
-
5. tan (A-B) tanA tanB
= +
3. tARZA 2tqnA
=
1 -
tanAt aR B 1 -
tan? A
6. taR (A +B) tamA -tanB
=
1 tanAtanB
+
them e
# ↑
↳
single angle double
angle 1.
angle between 0.360
compound & expand
angle 2. deduce quadrantsign
& expand
has a
boundary 3. Write rati
line
↓ 4. angle between 0-900 use reduction
reduce
special
# ↓
not special
angles &
co-ratio escape routes: 1. double
steps 2. Compound
1. quadrant
2.
sign
3. ratio
