Please answer the question

cos7x+sin4x=1

cos7x=1−sin4x

cos7x=1−(sinx)2

cos7x=(1−sin2x)(1+sin2x)

cos7x−cos2x(1+sinn2x)=0

cos2x[cos5x−1−sin2x]=0

cosx=0

x=−π2,π2,0.

Step-by-step explanation:

$13.2

$113.20

Step-by-step explanation:

Simple interest for the fourth year = 13.20 ( 3.30 - 4)

New amount in the bank acount for 4th year = 100+ (3.30 x4) = 113.20

Hope this helps

answer: 0+0=0

step-by-step explanation:

that is the only answer that can make 0

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐