Q7 iv part experts give solution (ii)
(iii)
sin 450
cos 450
tan 450
6. Prove that :
c
B
8.
(i) sin 600 = 2 sin 300 cos 300.
(ii) 4 (sin4 300 + cos 4 600)
— 3 (cos2 450
— sin2 900) = 2
(i) If sin x = cos x and x is acute, state the
value of x.
(ii) If sec A = cosec A and 00 A 900
state the value of A.
(iii) If tan 0 = cot 9 and 00 0 900 state
the value of 9.
= cos y; write the relation
(iv) If sin x
between x and y, if both the angles x and
y are acute.
(i) If sin x = cos y, then x + y = 450.
frue or false.
