Question

10sin4x+15cos4x=27cosec6x+8sec6x​

Answer 1

Step-by-step explanation:

u=sin2(x)

we get:

10u²+15(1−u)²=6

25u²−30²+9=0

(5u−3)²=0

u=3/5

Now we want to know:

27/u³+8/(1−u)³

=3³/(3/5)³+2³/(2/5)³

=53+53=250

Hope it will help you...

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