Seca (111) cosa
-
ee
3.
Iftwo angles a and ß are complementary angre
(i) sin?a+sin?f=1
eos
(11) cotB+cos ß = cosa
x2
4. If sin 17° = . let us show that sec 17º – sin 73° =
y?
yvy2-x2
1
Let us show that sec2 12°
1
tan2 78°
6.
tan A
ZA+ZB = 90°, let us show that 1+
sec? A
tan B
7.
Let us show that cosec-22° cot268° = sin²22° + sin? 68° + cot268°
UD 5.
-
If ZP+ZQ=90°, let us show that,
sin P
sinP cos Q = cos P
V cos Q
9. let us prove that cot 12° cot 38° cot 52° cot 78° cot 60°
✓3
10. AOB is a diameter of a circle with centre O and Cis any point on the circle
B, C; and 0,C let us show that
(i) tanZABC=cotZACO (ii) sin’ZBCO +sin? ZACO=1
(iii) cosecZCAB-1=tan? ZABC
11. ABCD is a rectangular figure, joining A, C let us prove that.