pls..... tell me the correct answer
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Damini1111:
Thanks for helping but the answer is incorrect
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Answer:
Step-by-step explanation:
See the attachment :
sin 30° = 1/2
sin 45° = 1/√2
tan 30° = 1/√3
cos 30° = √3/2
cot 45° = 1
To find :
( 5 sin²30 + sin²45 - 4 tan²30 ) / ( 2 sin30 cos30 + cot 45 )
Step by step :
5 sin²30 + sin² 45 - 4 tan²30
⇒ 5 ( 1/2 )² + ( 1/√2 )² - 4 ( 1/√3 )²
⇒ 5 × 1/4 + 1/2 - 4/3
⇒ 5/4 + 1/2 - 4/3
⇒ ( 15 + 6 - 16 ) / 12
⇒ ( 21 - 16 ) / 12
⇒ 5/12
2 sin 30 cos 30 + cot 45
⇒ 2 ( 1/2 ) × √3/2 + 1
⇒ √3/2 + 1
Find the value .
Dividing the two values we get :-
( 5/12 ) / ( √3/2 + 1 )
⇒ ( 5/12 ) / ( √3 + 2 ) / 2
⇒ ( 5/6 ) / ( √3 + 2 )
⇒ ( 5/6 ) / ( √3 + 2 ) × ( √3 - 2 ) / ( √3 - 2 )
⇒ ( 5/6 ) ( √3 - 2 ) / [ (√3)² - 2² ]
⇒ ( 5/6 ) ( √3 - 2 ) / [ 3 - 4 ]
⇒ ( 5/6 ) ( √3 - 2 ) / ( - 1 )
⇒ 5/6 × ( 2 - √3 )
⇒ ( 10 - 5√3 ) / 6
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