Question

prove that 2[cos^4 60+sin^4 30]-[tan^260-cot^2 45]+3sec^2 30=9/4​

Answer 1

Step-by-step explanation:

Show that :

2 (cos

4

60

∘

+sin

4

30

∘

) - (tan

2

60

∘

+cot

2

45

∘

) + 3 sec

2

30

∘

=

4

1

11th

Maths

Trigonometric Functions

Trigonometric Functions

Show that :2 ( cos4 60∘ +...

MATHS

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Asked on December 26, 2019 by

Rammy Serai

Show that :

2 (cos

4

60

∘

+sin

4

30

∘

) - (tan

2

60

∘

+cot

2

45

∘

) + 3 sec

2

30

∘

=

4

1

MEDIUM

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ANSWER

2(cos

4

60

∘

+sin

4

30

∘

)−(tan

2

60

∘

+cot

2

45

∘

)+3sec

2

30

∘

so its is a next step....

=[(

2

1

)

4

+(

2

1

)

4

]−[(

3

)

2

+(1)

2

]+3(

3

2

)

2

=(

16

1

+

16

1

)−(3+1)+3×

3

4

=2×

8

1

−4+4=

4

1