Download App

Complementary Angles — MATHEMATICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9MATHEMATICSComplementary Angles2 Marks
Question
Evaluate $:\operatorname{cosec} (65^\circ + A) - \sec (25^\circ - A)$
✓

Answer

$\operatorname{cosec} (65^\circ + A) - \sec (25^\circ - A)$
$=\operatorname{cosec} [90^\circ - (25^\circ - A)] - \sec (25^\circ - A)$
$= \sec (25^\circ - A) - \sec (25^\circ - A)$
$= 0.$
 

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[2 Mark Question Answer]" from Complementary Angles→Complementary Angles — all question types→MATHEMATICS STD 9 question papers→ICSE Board STD 9 question papers→ICSE Board question paper generator→

Similar questions

Find the distance of the following points from the origin :
A (6,-6)
→
Express the following as a vulgar fraction in simplest form:
$0.1 \overline{36}$
→
Without using trigonometric tables, find the values of :
$\frac{4}{3} \tan ^2 30+\sin ^2 60-3 \cos ^2 60+\frac{3}{4} \tan ^2 60-2 \tan ^2 45$.
→
If $\left(a^2-4 a-1\right)=0$ and $a \neq 0$, find the values of :  $\left(a^2+\frac{1}{a^2}\right)$
→
A metal cube of edge 12 cm is melted and formed into three smaller cubes. If the edges of two smaller cubes are 6 cm and 8 cm, find the edge of third smaller cube.
→
In an office, mean of salaries of employees is ₹ 1,00,000 and median is ₹ 80,000. An employee will be considered Grade A officer if his income is at least ₹ 85,000. Based on the above information check the validity of the following statements.
(i) Number of Grade A officers is more than or equal to number of non Grade A officers.
(ii) Mean of salaries of Grade A officers is more than ₹ 1,00,000.
→
Factorise:
$4 x^2 y-9 y^3$
→
Express each of as a single logarithm:
$2+\frac{1}{2} \log _{10} 9-2 \log _{10} 5$
→
Factorise : $a^3-\frac{1}{a^3}-2 a+\frac{2}{a}$
→
Solve for $x$ :
$2 \log x+1=\log 250$
→