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Shubham

· started a discussion

· 1 Months ago

wrong answer (Question: 189937.0 )

ans will be 2sin(theta)

Question:
The value of sin (45º + \(\theta\)) – (cos 45º– \(\theta\)) is equal to –
Options:
A) 2 cos \(\theta\) 
B) 2 sin \(\theta\)
C) 1
D) 0
Solution:
Ans: (d)

sin (45º+ \(\theta\)) – cos (45º– \(\theta\)) 

= sin (45º+ \(\theta\)) – cos (90º– (45º+ \(\theta\))) 

= sin (45º+ \(\theta\)) – sin (45º+\(\theta\))

= 0 

SAIF KHAN

· commented

· 1 Months ago

but the que is wrong see ..

Knowledge Expert

· commented

· 1 Months ago

Can you explore????????????

Given answer is correct...

see:

sin (45º+ θ) – cos (45º– θ)

= sin (45º+ θ) – cos (90º– (45º+ θ))

= sin (45º+ θ) – sin (45º+θ)

= 0
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