Math, asked by jayb61, 3 months ago

If sin (x + iy) sin (@+ i&) = 1, show that
(i) tanh² y cosh² & = cos@
(ii) tanh² &cosh² y = cos x.​

Answers

Answered by itzPapaKaHelicopter
3

Suppose the loan is cleared in n months. Clearly, the amounts form an A.P. with first term 20 and the common difference 15.

∴ Sum of the amounts =3250

2

n

{2×20+(n−1)×15}=3250

2

n

(40+15n−15)=3250

⟹n(15n+25)=6500

⟹15

2

+25n−6500=0

⟹3n

2

+5n−1300=0

⟹(n−20)(3n+65)=0

⟹n=20 or, n=−

3

65

⟹n=20 [∵n

=

3

65

]

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