Answer:
12
Step-by-step explanation:
The answer is D I made a video incase you can’t see the picture well.
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Answer:
Because 5+5=10 and 7+7=14
Answer:

Step-by-step explanation:
Given: sin x + cos x
To change the given trigonometry expression in term of sine only.
Trigonometry identity:-
Expression: 
We get rid of cos x from expression and write as sine form.
Expression:

Hence, The final expression is only sine function.