Question

(cos 0° + sin 45° + sin 30°) (sin 90°
- cos 45º + cos 60°)​

Answer 1

Answer:

plz follow me plz

Step-by-step explanation:

cos0

o

+sin45

o

+sin30

o

)(sin90

o

−cos45

o

+cos60

o

)

=(1+

2

1

+

2

1

)(1−

2

1

+

2

1

)

=(1+

2

1

+

2

1

)(1+

2

1

−

2

1

)

=(

2

3

+

2

1

)(

2

3

−

2

1

)

=(

2

3

)

2

−(

2

1

)

2

=

4

9

−

2

1

=

4

7

Answer 2

Answer:

$\cos(0) + \sin(45) + \sin(30) \times \sin(90) - \cos(45) + \cos(60)$

$(1 + \frac{1}{ \sqrt{2} } + \frac{1}{2} )(1 - \frac{1}{ \sqrt{2} } + \frac{1}{2} ) \\ \\ = \frac{2 \sqrt{2 } + 2 + \sqrt{2} }{2 \sqrt{2} } \times \frac{2 \sqrt{2} - 2 + \sqrt{2} }{2 \sqrt{2} } \\ \\ = \frac{3 \sqrt{2 } + 2 }{2 \sqrt{2} } \times \frac{3 \sqrt{2} - 2 }{2 \sqrt{2} } \\ \\ = \frac{18 - 4}{2 \sqrt{2} \times 2 \sqrt{2} } \\ \\ = \frac{14}{8} \\ \\ = \frac{7}{4}$