(1+ sinß) COD
cosa
COSO
(i) sina+sin?B=1
(11) cotß+cos B
x2
y vyz-x?
= 1
4.
If sin 17° = $. let us show that sec 17° - sin 73°
y
5. Let us show that sec2 12°
tan78°
6. ZA+ZB = 90°, let us show that 1+
tan B
7.
Let us show that cosec-22° cot68° = sin²22° + sin’68° + cot68°
tan A = sec A
18. If ZP+ ZQ = 90°, let us show that,
sin P
sinP cos Q = cos P
cos Q.
9. let us prove that cot 12° cot 38° cot 52° cot 78° cot 60°
TO. AOB is a diameter of a circle with centre O and C is any point on the cir
B, C; and 0,C let us show that
(i) tanZABC = cotZACO (ii) sin’ZBCO+ sin’ZACO=1
(iii) cosec-ZCAB-1=tan? ZABC
rove that