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irinina [24]
2 years ago
14

Geometry plz help mee

Mathematics
1 answer:
KATRIN_1 [288]2 years ago
4 0

Answer:

Easy number 1 is 456 because if you simplify the answer in the right form you will get 456 and then add 10 and 20 to get 632 and your welcome your on your own for the last ones

Step-by-step explanation:

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4 years ago
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mars1129 [50]

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8 0
4 years ago
1. Derive this identity from the sum and difference formulas for cosine:
kenny6666 [7]

Answer:

See below.

Step-by-step explanation:

1.  (1 / 2)[cos(a – b) – cos(a + b)]

= 1/2 ( cosa cosb + sina sinb - (cosa cosb - sina sinb)

= 1/2 ( cosa cosb - cosa cos b + sina sinb + sina sinb)

= 1/2 ( 2 sina sinb)

= sina sinb.

(I  used the 2 identities   cos(a - b) = cosa cosb + sina sinb) and

cos (a + b) = cosa cosb - sina sinb.)

2.  sin (π/2 - x)  = sin (π/2) cos x - cos(π/2) sin x

     =    1 * cos x - 0 * sinx  

     =   cosx - 0

     = cos x.

  (I used the identity sin(a - b) = sina cosb - cosa sinb

 and the fact that  sin(π/2) = 1 and cos (π/2) = 0. )

7 0
3 years ago
Read 2 more answers
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