Please someone help me. It's about proving related to transformation of trigonometric ratios. Thank you!!
2 answers:
Answer: see proof below
<u>Step-by-step explanation:</u>
* Use the following Co-function Identity: sin A = cos(90 - A)
* Use the following Sum to Product Identities:
cos x - cos y = 2 sin [(x + y)/2] · sin [(x - y)/2]
cos x + cos y = 2 cos [(x + y)/2] · cos [(x - y)/2]
* Use the Unit Circle to evaluate cos 45 = sin 45 = √2/2
<u>Proof LHS → RHS</u>


LHS = RHS: tan 35 = tan 35
Answer:
see explanation
Step-by-step explanation:
Using sum to product identities
cos x - cos y = - 2sin(
)sin(
) = 2sin(
)sin(
)
cos x + cos y = 2cos(
)cos(
)
Note that
sin10° = sin(90 - 10)° = cos80°
Thus
← cancel 2 from numerator/ denominator
=
× 
= tan45° × tan35° { tan45° = 1 ]
= 1 × tan35°
= tan35° ← as required
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Answer:
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C. 1/2 + 1/2
D. 2 1/2 + 1
E. 4 1/2 + 2
Step-by-step explanation:
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Answer:
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Step-by-step explanation:
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Answer:

Step-by-step explanation:
Let
, we need to determine
, which can be found by applying the following property:
,
(1)
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Answer:
13
Step-by-step explanation:
6-(-7)=13