sin a= cosa then find the value of 2tan a + cos2 a
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Answered by
4
Heya
______________________________
Sin a = Cos a
=>
Tan a = 1
=>
Tan a = Tan 45
Becoz Tan 45 = 1
=>
a = 45
=>
2 × Tan ( 45 ) + Cos ( 90 )
=>
2 × 1 + 0
=>
= 2
______________________________
Sin a = Cos a
=>
Tan a = 1
=>
Tan a = Tan 45
Becoz Tan 45 = 1
=>
a = 45
=>
2 × Tan ( 45 ) + Cos ( 90 )
=>
2 × 1 + 0
=>
= 2
Answered by
1
Sina =cosa
Sina =sin(pi/2 -a)
a=pi/2 -a
a+a=pi/2
2a=pi/2
a=pi/4
substitute a=pi/4 in 2tana +cos 2a
2tanpi/4 +cos2(pi/4)
2(1)+0
2+0=2
2 is answer obtained
Sina =sin(pi/2 -a)
a=pi/2 -a
a+a=pi/2
2a=pi/2
a=pi/4
substitute a=pi/4 in 2tana +cos 2a
2tanpi/4 +cos2(pi/4)
2(1)+0
2+0=2
2 is answer obtained
Anonymous:
Cos 2a = Cos ( 2×45 ) = Cos 90 = 0
check out
I written correct only
Wow! u mean u haven't done mistake before my comment.
yes
ohk...have a nyc tym.
I think u haven't checked correctly so check it again
G8 ur ans.
what
i mean your answer is now error free
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