If cosA sinA = 0,then (cosA + sinA)2 =?
A
0
B
2
C
3
D
1
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Question: If cosA sinA = 0,then (cosA + sinA)2 =?
Solution:
(cosA + sinA)2
= cos2A + 2 cosA sinA + sin2A
= 1 + 2.0 [sin2A + cos2A = 1]
= 1 + 0
= 1
0
Updated: 12 hours ago
5log105 - log1025 = কত?
Created: 4 weeks ago
A
log10 75
B
log10 25
C
log1015
D
log10125
প্রশ্ন: 5log105 - log1025 = কত?
সমাধান:
= 5log105 - log1025
= 5log105 - log1052
= 5log105 - 2log105
= 3log105
= log1053
= log10125
0
Updated: 4 weeks ago
যদি log10x = - 3 হয়, তবে x এর মান কত?
Created: 2 months ago
A
0.1
B
0.01
C
0.001
D
0.0001
প্রশ্ন: যদি log10x = - 3 হয়, তবে x এর মান কত?
সমাধান:
দেওয়া আছে,
log10x = - 3
⇒ x = 10- 3
⇒ x = 1/103
⇒ x = 1/1000
∴ x = 0.001
0
Updated: 2 months ago
logx(1/8) = - 2 হলে, x = কত?
Created: 1 month ago
A
2
B
√2
C
2√2
D
4
প্রশ্ন: logx(1/8) = - 2 হলে, x = কত?
সমাধান:
logx(1/8) = - 2
⇒ x- 2 = 1/8
⇒ 1/x2 = 1/8
⇒ x2 = (2√2)2
⇒ x = 2√2
0
Updated: 1 month ago
