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Hey !!!
Q. 9
cos0° + cosπ/7 + cos2π/7 + cos3π/7 + cos4π/7 + cos5π/7 + cos6π/7
=> 1 + cosπ/7 + cos(π - 5π/7 ) + cos(π - 4π/7) + cos4π/7 + cos5π/7 + cos(π - π/7)
=> 1 + cosπ/7 - cos5π/7 - cos4π/7 + cos4π/7 + cos5π/7 - cosπ/7
=> 1 Answer ✔
hence, option *D* is correct option !!!
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Q. 10
from LHS
xsin45° cos²60°
x ×1/√2 ×(√3/2 )²
x3/4√2
Now , from Rhs ✒
tan²60° cosec30° /sec45° cot²30°
=> (√3)² × 2 / √2 × (√3)²
=> 6
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3√2
=> 6/3√2 = √2
•°• LHS = RHS
x3/4√2 = √2
x = 8/3
hence, option *D* is correct answer
_____________________________
Hope it helps you !!
@Rajukumar111
Q. 9
cos0° + cosπ/7 + cos2π/7 + cos3π/7 + cos4π/7 + cos5π/7 + cos6π/7
=> 1 + cosπ/7 + cos(π - 5π/7 ) + cos(π - 4π/7) + cos4π/7 + cos5π/7 + cos(π - π/7)
=> 1 + cosπ/7 - cos5π/7 - cos4π/7 + cos4π/7 + cos5π/7 - cosπ/7
=> 1 Answer ✔
hence, option *D* is correct option !!!
________________________________
Q. 10
from LHS
xsin45° cos²60°
x ×1/√2 ×(√3/2 )²
x3/4√2
Now , from Rhs ✒
tan²60° cosec30° /sec45° cot²30°
=> (√3)² × 2 / √2 × (√3)²
=> 6
-----------
3√2
=> 6/3√2 = √2
•°• LHS = RHS
x3/4√2 = √2
x = 8/3
hence, option *D* is correct answer
_____________________________
Hope it helps you !!
@Rajukumar111
Answered by
0
Answer:
hi evruone pleasemark as brainlist
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