Question

SECTION C- (1 x 20 = 20 marks)
(Compulsory)
17. R and D Expenditure and rate of return are given
below:
Forecast the rate of return when the R and D
expenditure is 40 lakh and what will be the
R and D expenditure to have a rate of return of
25 core.
Rate of return 12 15 14 18 17 15 20
R&D expenditure 12 16 18 20 18 25 30

Answer 1

Answer:

Given : $\sf{\sin A = \dfrac{3}{5}}$

Need To Find : The value of cos A .

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❍ Basic Formulas of Trigonometry is given by :

$\boxed { \begin{array}{c c} \\ \dag \qquad \large {\underline {\bf{ Some \:Basic\:Formulas \:For\:Trigonometry \::}}}\\\\ \sf{ In \:a \:Right \:Angled \: Triangle-:} \\\\ \sf {\star Sin \theta = \dfrac{Perpendicular}{Hypotenuse}} \\\\ \sf{ \star \cos \theta = \dfrac{ Base }{Hypotenuse}}\\\\ \sf{\star \tan \theta = \dfrac{Perpendicular}{Base}} \end{array}}$

Then,

$\sf{\sin A = \dfrac{3}{5}= \dfrac{Perpendicular} { Hypotenuse} }$

Therefore,

Perpendicular of Right Angled Triangle is 3 cm .

Hypotenuse of Right angled triangle is 5 cm .

Finding Base of Right angled triangle :

$\sf{\underline {\dag As, \:We \:Know\:that \::}}\\ \bf{ By \:Pythagoras\:Theorem\::}$

$\underline {\boxed {\sf{\star (Perpendicular)^{2} + Base^{2} = ( Hypotenuse)^{2} }}}$