The answer is similar.
1 answer:
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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
Answer:
Step-by-step explanation:
Given;
x² - 2x - 1 = 0
Solve by completing the square method;
⇒ take the constant to the right hand side of the equation.
x² - 2x = 1
⇒ take half of coefficient of x = ¹/₂ x -2 = -1
⇒ square half of coefficient of x and add it to the both sides of the equation
⇒ take the square root of both sides;
Therefore, option B is the right solution.
Answer:
7 inches.
Step-by-step explanation:
Longest book length - Shortest book length