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aletadaboss
05.07.2019 •
Mathematics
11.15+11.75+10.70 i need some with this problem
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Ответ:
33.60 is your answer
Step-by-step explanation:
Remember to add based on place value.
Note that 10.70 is the same as 10.7
11.15 + 11.75 = 22.90
22.90 + 10.7 = 33.60
~Senpai
Ответ:
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. )