Most Important Questions on Trigonometry 27 Aug 2012
Question for practice
The following questions are more helpful for class tenth students for all boards.
Questions 18. If A + B = 90 (deg) and B = 2A, then the value of sin(sq)A + cos(sq)B.
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A+B=90 A=90-B
ReplyDeleteB=2(90-B) B=180-2B 3B=180 B=60 So A=30
sin(sq)30+cos(sq)60
(1/2)^2 + (1/2)^2
1/4 + 1/4 = 1/2
sin(sq)A + cos(sq)B=1/2
A+B = 90
ReplyDeleteB=2A
=> A=B/2
A+2A = 90
A = 30
B/2 + B = 90
3B = 180
B = 60
sin(sq)A + cos(sq)B
sin(sq)30 + cos(sq)60
(1/2)^2 + (1/2)^2
1/4 + 1/4 = 1/2
Ans. A + B = 90
ReplyDeleteB = 2A
so, A +2A = 90
or 3A = 90
or A = 30
B = 2A
or A = B/2
so, B/2 +B = 90
or 3B = 180
or B = 60
therefore, sin(sq.)A + cos(sq.)B
= sin(sq.)30 + cos(sq.)60
= (1/2)^2 + (1/2)^2
= 1/4 +1/4
= 2/4
= 1/2
A + B = 90
ReplyDeleteB = 2A
so, A +2A = 90
or 3A = 90
or A = 30
B = 2A
or A = B/2
so, B/2 +B = 90
or 3B = 180
or B = 60
therefore, sin(sq.)A + cos(sq.)B
= sin(sq.)30 + cos(sq.)60
= (1/2)^2 + (1/2)^2
= 1/4 +1/4
= 2/4
= 1/2
a+b=90
ReplyDeleteb=2a
a+2a=90
3a=90
a=30 and b=60
sin square a+cos square b=
1/4+1/4=2/4=1/2